diff --git a/_javascript/commons/topbar-switch.js b/_javascript/commons/topbar-switch.js
index 1740d1f..b8942dd 100644
--- a/_javascript/commons/topbar-switch.js
+++ b/_javascript/commons/topbar-switch.js
@@ -4,6 +4,7 @@
 
 $(function() {
   const $topbarWrapper = $("#topbar-wrapper");
+  const $topbarTitle = $("#topbar-title");
   const $panel = $("#panel-wrapper");
   const $searchInput = $("#search-input");
 
@@ -54,7 +55,7 @@ $(function() {
   }
 
   $(window).scroll(function(event) {
-    if ($("#topbar-title").is(":hidden")) {
+    if ($topbarTitle.is(":hidden")) {
       didScroll = true;
     }
   });
diff --git a/_javascript/commons/topbar-title.js b/_javascript/commons/topbar-title.js
index 6bc7805..2208afa 100644
--- a/_javascript/commons/topbar-title.js
+++ b/_javascript/commons/topbar-title.js
@@ -1,46 +1,61 @@
 /*
- * Top bar title auto change while scrolling in mobile screens.
+ * Top bar title auto change while scrolling up/down in mobile screens.
 */
 
 $(function() {
+  const titleSelector = "div.post>h1:first-of-type";
+  const $pageTitle = $(titleSelector);
+  const $topbarTitle = $("#topbar-title");
 
-  const topbarTitle = $("#topbar-title");
-  const postTitle = $("div.post>h1");
+  if ($pageTitle.length === 0 /* on Home page */
+      || $pageTitle.hasClass("dynamic-title")
+      || $topbarTitle.is(":hidden")) {/* not in mobile views */
+    return;
+  }
 
-  const DEFAULT = topbarTitle.text().trim();
-
-  let title = (postTitle.length > 0) ?
-    postTitle.text().trim() : $("h1").text().trim();
+  const defaultTitleText = $topbarTitle.text().trim();
+  let titleText = $pageTitle.text().trim();
+  let hasScrolled = false;
+  let lastScrollTop = 0;
 
   if ($("#page-category").length || $("#page-tag").length) {
     /* The title in Category or Tag page will be "<title> <count_of_posts>" */
-    if (/\s/.test(title)) {
-      title = title.replace(/[0-9]/g, "").trim();
+    if (/\s/.test(titleText)) {
+      titleText = titleText.replace(/[0-9]/g, "").trim();
     }
   }
 
-  /* Replace topbar title while scroll screens. */
-  $(window).scroll(function () {
-    if ($("#post-list").length /* in Home page */
-      || postTitle.is(":hidden") /* is tab pages */
-      || topbarTitle.is(":hidden") /* not mobile screens */
-      || $("#sidebar.sidebar-expand").length) { /* when the sidebar trigger is clicked */
-      return false;
+  let options = {
+    rootMargin: '-48px 0px 0px 0px', // 48px equals to the topbar height (3rem)
+    threshold: [0, 1]
+  };
+
+  let observer = new IntersectionObserver((entries) => {
+    if (!hasScrolled) {
+      hasScrolled = true;
+      return;
     }
 
-    if ($(this).scrollTop() >= 95) {
-      if (topbarTitle.text() !== title) {
-        topbarTitle.text(title);
+    let curScrollTop = $(window).scrollTop();
+    let isScrollDown = lastScrollTop < curScrollTop;
+    lastScrollTop = curScrollTop;
+    let heading = entries[0];
+
+    if (isScrollDown) {
+      if (heading.intersectionRatio === 0) {
+        $topbarTitle.text(titleText);
       }
     } else {
-      if (topbarTitle.text() !== DEFAULT) {
-        topbarTitle.text(DEFAULT);
+      if (heading.intersectionRatio === 1) {
+        $topbarTitle.text(defaultTitleText);
       }
     }
-  });
+  }, options);
 
-  /* Click title remove hover effect. */
-  topbarTitle.click(function() {
+  observer.observe(document.querySelector(titleSelector));
+
+  /* Click title will scroll to top */
+  $topbarTitle.click(function() {
     $("body,html").animate({scrollTop: 0}, 800);
   });
 
diff --git a/_javascript/copyright b/_javascript/copyright
index 1784fc4..05f7727 100644
--- a/_javascript/copyright
+++ b/_javascript/copyright
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.0.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.0.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/_javascript/utils/smooth-scroll.js b/_javascript/utils/smooth-scroll.js
index 45e84b0..a8ad44c 100644
--- a/_javascript/utils/smooth-scroll.js
+++ b/_javascript/utils/smooth-scroll.js
@@ -21,81 +21,92 @@ $(function() {
     .not("[href='#']")
     .not("[href='#0']")
     .click(function(event) {
-      if (this.pathname.replace(/^\//, "") === location.pathname.replace(/^\//, "")) {
-        if (location.hostname === this.hostname) {
-          const hash = decodeURI(this.hash);
-          let toFootnoteRef = RegExp(/^#fnref:/).test(hash);
-          let toFootnote = toFootnoteRef? false : RegExp(/^#fn:/).test(hash);
-          let selector = hash.includes(":") ? hash.replace(/\:/g, "\\:") : hash;
-          let $target = $(selector);
 
-          let parent = $(this).parent().prop("tagName");
-          let isAnchor = RegExp(/^H\d/).test(parent);
-          let isMobileViews = !$topbarTitle.is(":hidden");
+      if (this.pathname.replace(/^\//, "") !== location.pathname.replace(/^\//, "")) {
+        return;
+      }
 
-          if (typeof $target !== "undefined") {
-            event.preventDefault();
+      if (location.hostname !== this.hostname) {
+        return;
+      }
 
-            if (history.pushState) { /* add hash to URL */
-              history.pushState(null, null, hash);
-            }
+      const hash = decodeURI(this.hash);
+      let toFootnoteRef = RegExp(/^#fnref:/).test(hash);
+      let toFootnote = toFootnoteRef ? false : RegExp(/^#fn:/).test(hash);
+      let selector = hash.includes(":") ? hash.replace(/\:/g, "\\:") : hash;
+      let $target = $(selector);
 
-            let curOffset = isAnchor? $(this).offset().top : $(window).scrollTop();
-            let destOffset = $target.offset().top -= REM / 2;
+      let parent = $(this).parent().prop("tagName");
+      let isAnchor = RegExp(/^H\d/).test(parent);
+      let isMobileViews = !$topbarTitle.is(":hidden");
 
-            if (destOffset < curOffset) { // scroll up
-              if (!isAnchor && !toFootnote) { // trigger by ToC item
-                if (!isMobileViews) { // on desktop/tablet screens
-                  $topbarWrapper.removeClass("topbar-down").addClass("topbar-up");
-                  // Send message to `${JS_ROOT}/commons/topbar-switch.js`
-                  $topbarWrapper.attr(ATTR_TOC_SCROLLING, true);
-                  tocScrollUpCount += 1;
-                }
-              }
+      if (typeof $target === "undefined") {
+        return;
+      }
 
-              if ((isAnchor || toFootnoteRef) && isMobileViews) {
-                destOffset -= topbarHeight;
-              }
-            }
+      event.preventDefault();
 
-            $("html").animate({
-              scrollTop: destOffset
-            }, 500, () => {
-              $target.focus();
+      if (history.pushState) { /* add hash to URL */
+        history.pushState(null, null, hash);
+      }
 
-              /* clean up old scroll mark */
-              if ($(`[${SCROLL_MARK}=true]`).length) {
-                $(`[${SCROLL_MARK}=true]`).attr(SCROLL_MARK, false);
-              }
+      let curOffset = isAnchor ? $(this).offset().top : $(window).scrollTop();
+      let destOffset = $target.offset().top -= REM / 2;
 
-              /* Clean :target links */
-              if ($(":target").length) { /* element that visited by the URL with hash */
-                $(":target").attr(SCROLL_MARK, false);
-              }
-
-              /* set scroll mark to footnotes */
-              if (toFootnote || toFootnoteRef) {
-                $target.attr(SCROLL_MARK, true);
-              }
-
-              if ($target.is(":focus")) { /* Checking if the target was focused */
-                return false;
-              } else {
-                $target.attr("tabindex", "-1"); /* Adding tabindex for elements not focusable */
-                $target.focus(); /* Set focus again */
-              }
-
-              if (typeof $topbarWrapper.attr(ATTR_TOC_SCROLLING) !== "undefined") {
-                tocScrollUpCount -= 1;
-
-                if (tocScrollUpCount <= 0) {
-                  $topbarWrapper.attr(ATTR_TOC_SCROLLING, "false");
-                }
-              }
-            });
+      if (destOffset < curOffset) { // scroll up
+        if (!isAnchor && !toFootnote) { // trigger by ToC item
+          if (!isMobileViews) { // on desktop/tablet screens
+            $topbarWrapper.removeClass("topbar-down").addClass("topbar-up");
+            // Send message to `${JS_ROOT}/commons/topbar-switch.js`
+            $topbarWrapper.attr(ATTR_TOC_SCROLLING, true);
+            tocScrollUpCount += 1;
           }
         }
+
+        if ((isAnchor || toFootnoteRef) && isMobileViews) {
+          destOffset -= topbarHeight;
+        }
+
+      } else {
+        if (isMobileViews) {
+          destOffset -= topbarHeight;
+        }
       }
 
+      $("html").animate({
+        scrollTop: destOffset
+      }, 500, () => {
+        $target.focus();
+
+        /* clean up old scroll mark */
+        if ($(`[${SCROLL_MARK}=true]`).length) {
+          $(`[${SCROLL_MARK}=true]`).attr(SCROLL_MARK, false);
+        }
+
+        /* Clean :target links */
+        if ($(":target").length) { /* element that visited by the URL with hash */
+          $(":target").attr(SCROLL_MARK, false);
+        }
+
+        /* set scroll mark to footnotes */
+        if (toFootnote || toFootnoteRef) {
+          $target.attr(SCROLL_MARK, true);
+        }
+
+        if ($target.is(":focus")) { /* Checking if the target was focused */
+          return false;
+        } else {
+          $target.attr("tabindex", "-1"); /* Adding tabindex for elements not focusable */
+          $target.focus(); /* Set focus again */
+        }
+
+        if (typeof $topbarWrapper.attr(ATTR_TOC_SCROLLING) !== "undefined") {
+          tocScrollUpCount -= 1;
+
+          if (tocScrollUpCount <= 0) {
+            $topbarWrapper.attr(ATTR_TOC_SCROLLING, "false");
+          }
+        }
+      });
     }); /* click() */
 });
diff --git a/_sass/addon/commons.scss b/_sass/addon/commons.scss
index 32da462..13a11e9 100644
--- a/_sass/addon/commons.scss
+++ b/_sass/addon/commons.scss
@@ -1335,6 +1335,10 @@ $sidebar-display: "sidebar-display";
     min-width: 150px;
   }
 
+  #search-hints {
+    display: none;
+  }
+
   #search-result-wrapper {
     margin-top: 3rem;
   }
@@ -1492,10 +1496,6 @@ $sidebar-display: "sidebar-display";
     }
   }
 
-  #search-hints {
-    display: none;
-  }
-
   .post-content {
     font-size: 1.03rem;
   }
diff --git a/_sass/jekyll-theme-chirpy.scss b/_sass/jekyll-theme-chirpy.scss
index 2d20cc2..ce147a8 100644
--- a/_sass/jekyll-theme-chirpy.scss
+++ b/_sass/jekyll-theme-chirpy.scss
@@ -1,7 +1,7 @@
 /*!
  * The styles for Jekyll theme Chirpy
  *
- * Chirpy v5.0.1 (https://github.com/cotes2020/jekyll-theme-chirpy)
+ * Chirpy v5.0.2 (https://github.com/cotes2020/jekyll-theme-chirpy)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/assets/js/dist/categories.min.js b/assets/js/dist/categories.min.js
index 611e5e8..5aa4341 100644
--- a/assets/js/dist/categories.min.js
+++ b/assets/js/dist/categories.min.js
@@ -1,6 +1,6 @@
 /*!
- * Chirpy v5.0.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.0.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(e=>{const o=$(e.target);let t=o.prop("tagName")==="button".toUpperCase()?o:o.parent();t.blur(),flipMode()})}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),t=$("#search-cancel"),s=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),r=$("#search-wrapper"),n=$("#search-result-wrapper"),d=$("#search-results"),i=$("#search-input"),c=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),f={on(){e.addClass("unloaded"),l.addClass("unloaded"),o.addClass("unloaded"),r.addClass("d-flex"),t.addClass("loaded")},off(){t.removeClass("loaded"),r.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),o.removeClass("unloaded")}},p=function(){let e=!1;return{on(){e||(u.block(),n.removeClass("unloaded"),a.addClass("unloaded"),e=!0)},off(){e&&(d.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),n.addClass("unloaded"),s.removeClass("visible"),a.removeClass("unloaded"),u.release(),i.val(""),e=!1)},isVisible(){return e}}}();function h(){return t.hasClass("loaded")}o.click(function(){f.on(),p.on(),i.focus()}),t.click(function(){f.off(),p.off()}),i.focus(function(){r.addClass("input-focus")}),i.focusout(function(){r.removeClass("input-focus")}),i.on("keyup",function(e){8===e.keyCode&&""===i.val()?h()?c.removeClass("unloaded"):p.off():""!==i.val()&&(p.on(),s.hasClass("visible")||s.addClass("visible"),h()&&c.addClass("unloaded"))}),s.on("click",function(){i.val(""),h()?(c.removeClass("unloaded"),d.empty()):p.off(),i.focus(),s.removeClass("visible")})}),$(function(){var e=function(){const e="sidebar-display";let o=!1;const t=$("body");return{toggle(){!1===o?t.attr(e,""):t.removeAttr(e),o=!o}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const t=$("#topbar-wrapper"),s=$("#panel-wrapper"),a=$("#search-input"),l="topbar-up",r="topbar-down",n="toc-scrolling-up";let o,d=0;const i=t.outerHeight(),c=t.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(o=!0)}),setInterval(function(){o&&(function(){var e,o=$(this).scrollTop();Math.abs(d-o)<=i||(o>d?o>c&&(t.removeClass(r).addClass(l),s.removeClass(r),a.is(":focus")&&a.blur()):o+$(window).height()<$(document).height()&&(void 0!==(e=t.attr(n))?"false"===e&&t.removeAttr(n):(t.removeClass(l).addClass(r),s.addClass(r))),d=o)}(),o=!1)},250)}),$(function(){const e=$("#topbar-title"),o=$("div.post>h1"),t=e.text().trim();let s=(0<o.length?o:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(s)&&(s=s.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||o.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?e.text()!==s&&e.text(s):e.text()!==t&&e.text(t))}),e.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){const e=$(".collapse");e.on("hide.bs.collapse",function(){var e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder-open`).attr("class","far fa-folder fa-fw"),$(`#${e} i.fas`).addClass("rotate"),$("#"+e).removeClass("hide-border-bottom"))}),e.on("show.bs.collapse",function(){var e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder`).attr("class","far fa-folder-open fa-fw"),$(`#${e} i.fas`).removeClass("rotate"),$("#"+e).addClass("hide-border-bottom"))})});
\ No newline at end of file
+$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(e=>{const o=$(e.target);let t=o.prop("tagName")==="button".toUpperCase()?o:o.parent();t.blur(),flipMode()})}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),t=$("#search-cancel"),s=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),r=$("#search-wrapper"),n=$("#search-result-wrapper"),d=$("#search-results"),i=$("#search-input"),c=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),f={on(){e.addClass("unloaded"),l.addClass("unloaded"),o.addClass("unloaded"),r.addClass("d-flex"),t.addClass("loaded")},off(){t.removeClass("loaded"),r.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),o.removeClass("unloaded")}},p=function(){let e=!1;return{on(){e||(u.block(),n.removeClass("unloaded"),a.addClass("unloaded"),e=!0)},off(){e&&(d.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),n.addClass("unloaded"),s.removeClass("visible"),a.removeClass("unloaded"),u.release(),i.val(""),e=!1)},isVisible(){return e}}}();function h(){return t.hasClass("loaded")}o.click(function(){f.on(),p.on(),i.focus()}),t.click(function(){f.off(),p.off()}),i.focus(function(){r.addClass("input-focus")}),i.focusout(function(){r.removeClass("input-focus")}),i.on("keyup",function(e){8===e.keyCode&&""===i.val()?h()?c.removeClass("unloaded"):p.off():""!==i.val()&&(p.on(),s.hasClass("visible")||s.addClass("visible"),h()&&c.addClass("unloaded"))}),s.on("click",function(){i.val(""),h()?(c.removeClass("unloaded"),d.empty()):p.off(),i.focus(),s.removeClass("visible")})}),$(function(){var e=function(){const e="sidebar-display";let o=!1;const t=$("body");return{toggle(){!1===o?t.attr(e,""):t.removeAttr(e),o=!o}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const t=$("#topbar-wrapper"),o=$("#topbar-title"),s=$("#panel-wrapper"),a=$("#search-input"),l="topbar-up",r="topbar-down",n="toc-scrolling-up";let d,i=0;const c=t.outerHeight(),u=t.outerHeight();$(window).scroll(function(e){o.is(":hidden")&&(d=!0)}),setInterval(function(){d&&(function(){var e,o=$(this).scrollTop();Math.abs(i-o)<=c||(o>i?o>u&&(t.removeClass(r).addClass(l),s.removeClass(r),a.is(":focus")&&a.blur()):o+$(window).height()<$(document).height()&&(void 0!==(e=t.attr(n))?"false"===e&&t.removeAttr(n):(t.removeClass(l).addClass(r),s.addClass(r))),i=o)}(),d=!1)},250)}),$(function(){var o="div.post>h1:first-of-type";const t=$(o),r=$("#topbar-title");if(0!==t.length&&!t.hasClass("dynamic-title")&&!r.is(":hidden")){const n=r.text().trim();let s=t.text().trim(),a=!1,l=0;($("#page-category").length||$("#page-tag").length)&&/\s/.test(s)&&(s=s.replace(/[0-9]/g,"").trim());let e=new IntersectionObserver(e=>{var o,t;a?(o=$(window).scrollTop(),t=l<o,l=o,e=e[0],t?0===e.intersectionRatio&&r.text(s):1===e.intersectionRatio&&r.text(n)):a=!0},{rootMargin:"-48px 0px 0px 0px",threshold:[0,1]});e.observe(document.querySelector(o)),r.click(function(){$("body,html").animate({scrollTop:0},800)})}}),$(function(){const e=$(".collapse");e.on("hide.bs.collapse",function(){var e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder-open`).attr("class","far fa-folder fa-fw"),$(`#${e} i.fas`).addClass("rotate"),$("#"+e).removeClass("hide-border-bottom"))}),e.on("show.bs.collapse",function(){var e="h_"+$(this).attr("id").substring("l_".length);e&&($(`#${e} .far.fa-folder`).attr("class","far fa-folder-open fa-fw"),$(`#${e} i.fas`).removeClass("rotate"),$("#"+e).addClass("hide-border-bottom"))})});
\ No newline at end of file
diff --git a/assets/js/dist/commons.min.js b/assets/js/dist/commons.min.js
index 5ea9898..b686a1f 100644
--- a/assets/js/dist/commons.min.js
+++ b/assets/js/dist/commons.min.js
@@ -1,6 +1,6 @@
 /*!
- * Chirpy v5.0.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.0.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(e=>{const o=$(e.target);let t=o.prop("tagName")==="button".toUpperCase()?o:o.parent();t.blur(),flipMode()})}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),t=$("#search-cancel"),s=$("#search-cleaner"),l=$("#main"),a=$("#topbar-title"),n=$("#search-wrapper"),r=$("#search-result-wrapper"),d=$("#search-results"),i=$("#search-input"),c=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),p={on(){e.addClass("unloaded"),a.addClass("unloaded"),o.addClass("unloaded"),n.addClass("d-flex"),t.addClass("loaded")},off(){t.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),a.removeClass("unloaded"),o.removeClass("unloaded")}},f=function(){let e=!1;return{on(){e||(u.block(),r.removeClass("unloaded"),l.addClass("unloaded"),e=!0)},off(){e&&(d.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),r.addClass("unloaded"),s.removeClass("visible"),l.removeClass("unloaded"),u.release(),i.val(""),e=!1)},isVisible(){return e}}}();function h(){return t.hasClass("loaded")}o.click(function(){p.on(),f.on(),i.focus()}),t.click(function(){p.off(),f.off()}),i.focus(function(){n.addClass("input-focus")}),i.focusout(function(){n.removeClass("input-focus")}),i.on("keyup",function(e){8===e.keyCode&&""===i.val()?h()?c.removeClass("unloaded"):f.off():""!==i.val()&&(f.on(),s.hasClass("visible")||s.addClass("visible"),h()&&c.addClass("unloaded"))}),s.on("click",function(){i.val(""),h()?(c.removeClass("unloaded"),d.empty()):f.off(),i.focus(),s.removeClass("visible")})}),$(function(){var e=function(){const e="sidebar-display";let o=!1;const t=$("body");return{toggle(){!1===o?t.attr(e,""):t.removeAttr(e),o=!o}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const t=$("#topbar-wrapper"),s=$("#panel-wrapper"),l=$("#search-input"),a="topbar-up",n="topbar-down",r="toc-scrolling-up";let o,d=0;const i=t.outerHeight(),c=t.outerHeight();$(window).scroll(function(e){$("#topbar-title").is(":hidden")&&(o=!0)}),setInterval(function(){o&&(function(){var e,o=$(this).scrollTop();Math.abs(d-o)<=i||(o>d?o>c&&(t.removeClass(n).addClass(a),s.removeClass(n),l.is(":focus")&&l.blur()):o+$(window).height()<$(document).height()&&(void 0!==(e=t.attr(r))?"false"===e&&t.removeAttr(r):(t.removeClass(a).addClass(n),s.addClass(n))),d=o)}(),o=!1)},250)}),$(function(){const e=$("#topbar-title"),o=$("div.post>h1"),t=e.text().trim();let s=(0<o.length?o:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(s)&&(s=s.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||o.is(":hidden")||e.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?e.text()!==s&&e.text(s):e.text()!==t&&e.text(t))}),e.click(function(){$("body,html").animate({scrollTop:0},800)})});
\ No newline at end of file
+$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(e=>{const o=$(e.target);let t=o.prop("tagName")==="button".toUpperCase()?o:o.parent();t.blur(),flipMode()})}),$(function(){const e=$("#sidebar-trigger"),o=$("#search-trigger"),t=$("#search-cancel"),s=$("#search-cleaner"),a=$("#main"),l=$("#topbar-title"),n=$("#search-wrapper"),r=$("#search-result-wrapper"),i=$("#search-results"),d=$("#search-input"),c=$("#search-hints"),u=function(){let e=0;return{block(){e=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(e)},getOffset(){return e}}}(),p={on(){e.addClass("unloaded"),l.addClass("unloaded"),o.addClass("unloaded"),n.addClass("d-flex"),t.addClass("loaded")},off(){t.removeClass("loaded"),n.removeClass("d-flex"),e.removeClass("unloaded"),l.removeClass("unloaded"),o.removeClass("unloaded")}},f=function(){let e=!1;return{on(){e||(u.block(),r.removeClass("unloaded"),a.addClass("unloaded"),e=!0)},off(){e&&(i.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),r.addClass("unloaded"),s.removeClass("visible"),a.removeClass("unloaded"),u.release(),d.val(""),e=!1)},isVisible(){return e}}}();function m(){return t.hasClass("loaded")}o.click(function(){p.on(),f.on(),d.focus()}),t.click(function(){p.off(),f.off()}),d.focus(function(){n.addClass("input-focus")}),d.focusout(function(){n.removeClass("input-focus")}),d.on("keyup",function(e){8===e.keyCode&&""===d.val()?m()?c.removeClass("unloaded"):f.off():""!==d.val()&&(f.on(),s.hasClass("visible")||s.addClass("visible"),m()&&c.addClass("unloaded"))}),s.on("click",function(){d.val(""),m()?(c.removeClass("unloaded"),i.empty()):f.off(),d.focus(),s.removeClass("visible")})}),$(function(){var e=function(){const e="sidebar-display";let o=!1;const t=$("body");return{toggle(){!1===o?t.attr(e,""):t.removeAttr(e),o=!o}}}();$("#sidebar-trigger").click(e.toggle),$("#mask").click(e.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const t=$("#topbar-wrapper"),o=$("#topbar-title"),s=$("#panel-wrapper"),a=$("#search-input"),l="topbar-up",n="topbar-down",r="toc-scrolling-up";let i,d=0;const c=t.outerHeight(),u=t.outerHeight();$(window).scroll(function(e){o.is(":hidden")&&(i=!0)}),setInterval(function(){i&&(function(){var e,o=$(this).scrollTop();Math.abs(d-o)<=c||(o>d?o>u&&(t.removeClass(n).addClass(l),s.removeClass(n),a.is(":focus")&&a.blur()):o+$(window).height()<$(document).height()&&(void 0!==(e=t.attr(r))?"false"===e&&t.removeAttr(r):(t.removeClass(l).addClass(n),s.addClass(n))),d=o)}(),i=!1)},250)}),$(function(){var o="div.post>h1:first-of-type";const t=$(o),n=$("#topbar-title");if(0!==t.length&&!t.hasClass("dynamic-title")&&!n.is(":hidden")){const r=n.text().trim();let s=t.text().trim(),a=!1,l=0;($("#page-category").length||$("#page-tag").length)&&/\s/.test(s)&&(s=s.replace(/[0-9]/g,"").trim());let e=new IntersectionObserver(e=>{var o,t;a?(o=$(window).scrollTop(),t=l<o,l=o,e=e[0],t?0===e.intersectionRatio&&n.text(s):1===e.intersectionRatio&&n.text(r)):a=!0},{rootMargin:"-48px 0px 0px 0px",threshold:[0,1]});e.observe(document.querySelector(o)),n.click(function(){$("body,html").animate({scrollTop:0},800)})}});
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diff --git a/assets/js/dist/home.min.js b/assets/js/dist/home.min.js
index 55576d2..23bf90c 100644
--- a/assets/js/dist/home.min.js
+++ b/assets/js/dist/home.min.js
@@ -1,6 +1,6 @@
 /*!
- * Chirpy v5.0.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.0.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(t=>{const e=$(t.target);let o=e.prop("tagName")==="button".toUpperCase()?e:e.parent();o.blur(),flipMode()})}),$(function(){const t=$("#sidebar-trigger"),e=$("#search-trigger"),o=$("#search-cancel"),a=$("#search-cleaner"),s=$("#main"),l=$("#topbar-title"),n=$("#search-wrapper"),r=$("#search-result-wrapper"),i=$("#search-results"),d=$("#search-input"),c=$("#search-hints"),u=function(){let t=0;return{block(){t=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(t)},getOffset(){return t}}}(),p={on(){t.addClass("unloaded"),l.addClass("unloaded"),e.addClass("unloaded"),n.addClass("d-flex"),o.addClass("loaded")},off(){o.removeClass("loaded"),n.removeClass("d-flex"),t.removeClass("unloaded"),l.removeClass("unloaded"),e.removeClass("unloaded")}},f=function(){let t=!1;return{on(){t||(u.block(),r.removeClass("unloaded"),s.addClass("unloaded"),t=!0)},off(){t&&(i.empty(),c.hasClass("unloaded")&&c.removeClass("unloaded"),r.addClass("unloaded"),a.removeClass("visible"),s.removeClass("unloaded"),u.release(),d.val(""),t=!1)},isVisible(){return t}}}();function h(){return o.hasClass("loaded")}e.click(function(){p.on(),f.on(),d.focus()}),o.click(function(){p.off(),f.off()}),d.focus(function(){n.addClass("input-focus")}),d.focusout(function(){n.removeClass("input-focus")}),d.on("keyup",function(t){8===t.keyCode&&""===d.val()?h()?c.removeClass("unloaded"):f.off():""!==d.val()&&(f.on(),a.hasClass("visible")||a.addClass("visible"),h()&&c.addClass("unloaded"))}),a.on("click",function(){d.val(""),h()?(c.removeClass("unloaded"),i.empty()):f.off(),d.focus(),a.removeClass("visible")})}),$(function(){var t=function(){const t="sidebar-display";let e=!1;const o=$("body");return{toggle(){!1===e?o.attr(t,""):o.removeAttr(t),e=!e}}}();$("#sidebar-trigger").click(t.toggle),$("#mask").click(t.toggle)}),$(function(){$('[data-toggle="tooltip"]').tooltip()}),$(function(){const o=$("#topbar-wrapper"),a=$("#panel-wrapper"),s=$("#search-input"),l="topbar-up",n="topbar-down",r="toc-scrolling-up";let e,i=0;const d=o.outerHeight(),c=o.outerHeight();$(window).scroll(function(t){$("#topbar-title").is(":hidden")&&(e=!0)}),setInterval(function(){e&&(function(){var t,e=$(this).scrollTop();Math.abs(i-e)<=d||(e>i?e>c&&(o.removeClass(n).addClass(l),a.removeClass(n),s.is(":focus")&&s.blur()):e+$(window).height()<$(document).height()&&(void 0!==(t=o.attr(r))?"false"===t&&o.removeAttr(r):(o.removeClass(l).addClass(n),a.addClass(n))),i=e)}(),e=!1)},250)}),$(function(){const t=$("#topbar-title"),e=$("div.post>h1"),o=t.text().trim();let a=(0<e.length?e:$("h1")).text().trim();($("#page-category").length||$("#page-tag").length)&&/\s/.test(a)&&(a=a.replace(/[0-9]/g,"").trim()),$(window).scroll(function(){return!($("#post-list").length||e.is(":hidden")||t.is(":hidden")||$("#sidebar.sidebar-expand").length)&&void(95<=$(this).scrollTop()?t.text()!==a&&t.text(a):t.text()!==o&&t.text(o))}),t.click(function(){$("body,html").animate({scrollTop:0},800)})}),$(function(){let o=$(".timeago").length,t=void 0;const s=$("meta[name=day-prompt]").attr("content"),l=$("meta[name=hour-prompt]").attr("content"),n=$("meta[name=minute-prompt]").attr("content"),r=$("meta[name=justnow-prompt]").attr("content");function e(){return $(".timeago").each(function(){var t,e;!1!==$(this)[0].hasAttribute("date")?(e=function(t,e){let o=new Date,a=new Date(t);return a.getFullYear()!==o.getFullYear()||a.getMonth()!==o.getMonth()?e:(t=Math.floor((o-a)/1e3),1<=(e=Math.floor(t/86400))?` ${e} `+s:1<=(e=Math.floor(t/3600))?` ${e} `+l:1<=(t=Math.floor(t/60))?` ${t} `+n:r)}($(this).attr("date"),t=$(this).text()))===t?$(this).removeAttr("date"):$(this).text(e):--o}),0===o&&void 0!==t&&clearInterval(t),o}0!==o&&0<e()&&(t=setInterval(e,6e4))});
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diff --git a/assets/js/dist/page.min.js b/assets/js/dist/page.min.js
index cdcf8af..5f041d0 100644
--- a/assets/js/dist/page.min.js
+++ b/assets/js/dist/page.min.js
@@ -1,6 +1,6 @@
 /*!
- * Chirpy v5.0.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.0.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-$(function(){$(window).scroll(()=>{50<$(this).scrollTop()&&"none"===$("#sidebar-trigger").css("display")?$("#back-to-top").fadeIn():$("#back-to-top").fadeOut()}),$("#back-to-top").click(()=>($("body,html").animate({scrollTop:0},800),!1))}),$(function(){$(".mode-toggle").click(t=>{const e=$(t.target);let o=e.prop("tagName")==="button".toUpperCase()?e:e.parent();o.blur(),flipMode()})}),$(function(){const t=$("#sidebar-trigger"),e=$("#search-trigger"),o=$("#search-cancel"),a=$("#search-cleaner"),l=$("#main"),s=$("#topbar-title"),n=$("#search-wrapper"),i=$("#search-result-wrapper"),r=$("#search-results"),c=$("#search-input"),d=$("#search-hints"),u=function(){let t=0;return{block(){t=window.scrollY,$("html,body").scrollTop(0)},release(){$("html,body").scrollTop(t)},getOffset(){return t}}}(),p={on(){t.addClass("unloaded"),s.addClass("unloaded"),e.addClass("unloaded"),n.addClass("d-flex"),o.addClass("loaded")},off(){o.removeClass("loaded"),n.removeClass("d-flex"),t.removeClass("unloaded"),s.removeClass("unloaded"),e.removeClass("unloaded")}},f=function(){let t=!1;return{on(){t||(u.block(),i.removeClass("unloaded"),l.addClass("unloaded"),t=!0)},off(){t&&(r.empty(),d.hasClass("unloaded")&&d.removeClass("unloaded"),i.addClass("unloaded"),a.removeClass("visible"),l.removeClass("unloaded"),u.release(),c.val(""),t=!1)},isVisible(){return t}}}();function h(){return 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diff --git a/assets/js/dist/post.min.js b/assets/js/dist/post.min.js
index e42751a..7353d90 100644
--- a/assets/js/dist/post.min.js
+++ b/assets/js/dist/post.min.js
@@ -1,6 +1,6 @@
 /*!
- * Chirpy v5.0.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.0.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
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e=t.parentNode.nextElementSibling;return e.querySelector("code .rouge-code")}});$(t).tooltip({trigger:"hover",placement:"left"});const a=function(t){let e=$(t).children();return e.attr("class")}(t);o.on("success",t=>{t.clearSelection();const e=t.trigger;var o;n(e)||(function(t){let e=$(t),o=e.children();o.attr("class","fas fa-check")}(e),o=e,t=$(o).attr("title-succeed"),$(o).attr("data-original-title",t).tooltip("show"),r(e),setTimeout(()=>{var t;t=e,$(t).tooltip("hide").removeAttr("data-original-title"),function(t){let e=$(t),o=e.children();o.attr("class",a)}(e),l(e)},2e3))}),$("#copy-link").click(t=>{let e=$(t.target);if(!n(e)){t=window.location.href;const o=$("<input>");$("body").append(o),o.val(t).select(),document.execCommand("copy"),o.remove();const a=e.attr("data-original-title");t=e.attr("title-succeed");e.attr("data-original-title",t).tooltip("show"),r(e),setTimeout(()=>{e.attr("data-original-title",a),l(e)},2e3)}})}),$(function(){const i=$("#topbar-wrapper"),c=i.outerHeight(),t=$("#topbar-title"),d="toc-scrolling-up",u="scroll-focus";let p=0;$("a[href*='#']").not("[href='#']").not("[href='#0']").click(function(n){if(this.pathname.replace(/^\//,"")===location.pathname.replace(/^\//,"")&&location.hostname===this.hostname){const s=decodeURI(this.hash);let e=RegExp(/^#fnref:/).test(s),o=!e&&RegExp(/^#fn:/).test(s);var r=s.includes(":")?s.replace(/\:/g,"\\:"):s;let a=$(r);var l=$(this).parent().prop("tagName"),r=RegExp(/^H\d/).test(l),l=!t.is(":hidden");if(void 0!==a){n.preventDefault(),history.pushState&&history.pushState(null,null,s);n=r?$(this).offset().top:$(window).scrollTop();let t=a.offset().top-=8;t<n?(r||o||l||(i.removeClass("topbar-down").addClass("topbar-up"),i.attr(d,!0),p+=1),(r||e)&&l&&(t-=c)):l&&(t-=c),$("html").animate({scrollTop:t},500,()=>(a.focus(),$(`[${u}=true]`).length&&$(`[${u}=true]`).attr(u,!1),$(":target").length&&$(":target").attr(u,!1),(o||e)&&a.attr(u,!0),a.is(":focus")?!1:(a.attr("tabindex","-1"),a.focus(),void(void 0!==i.attr(d)&&(--p,p<=0&&i.attr(d,"false"))))))}}})});
\ No newline at end of file
diff --git a/assets/js/dist/pvreport.min.js b/assets/js/dist/pvreport.min.js
index 9d57290..f0ba70c 100644
--- a/assets/js/dist/pvreport.min.js
+++ b/assets/js/dist/pvreport.min.js
@@ -1,5 +1,5 @@
 /*!
- * Chirpy v5.0.1 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * Chirpy v5.0.2 (https://github.com/cotes2020/jekyll-theme-chirpy/)
  * © 2019 Cotes Chung
  * MIT Licensed
  */
diff --git a/gulpfile.js/tasks/js.js b/gulpfile.js/tasks/js.js
index 101a4f7..dc6a14f 100644
--- a/gulpfile.js/tasks/js.js
+++ b/gulpfile.js/tasks/js.js
@@ -66,7 +66,8 @@ const pageJs = () => {
       `${JS_SRC}/commons/*.js`,
       `${JS_SRC}/utils/checkbox.js`,
       `${JS_SRC}/utils/img-extra.js`,
-      `${JS_SRC}/utils/clipboard.js`
+      `${JS_SRC}/utils/clipboard.js`,
+      `${JS_SRC}/utils/smooth-scroll.js`
     ], 'page'
   );
 };
diff --git a/jekyll-theme-chirpy.gemspec b/jekyll-theme-chirpy.gemspec
index 663c6c2..4d3d956 100644
--- a/jekyll-theme-chirpy.gemspec
+++ b/jekyll-theme-chirpy.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "jekyll-theme-chirpy"
-  spec.version       = "5.0.1"
+  spec.version       = "5.0.2"
   spec.authors       = ["Cotes Chung"]
   spec.email         = ["cotes.chung@gmail.com"]
 
diff --git a/package.json b/package.json
index 0381faa..0333b57 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "jekyll-theme-chirpy",
-  "version": "5.0.1",
+  "version": "5.0.2",
   "description": "A minimal, sidebar, responsive web design Jekyll theme that focuses on text presentation.",
   "main": "index.js",
   "directories": {