Prevent multiple reserse-footnote from overlapping (fix #439)

_javascript/utils/smooth-scroll.js

@@ -20,8 +20,8 @@ $(function() {
 
           const hash = decodeURI(this.hash);
           let isFnRef = RegExp(/^#fnref:/).test(hash);
-          let isFn = RegExp(/^#fn:/).test(hash);
-          let selector = hash.includes(":") ? hash.replace(/\:/, "\\:") : hash;
+          let isFn = isFnRef? false : RegExp(/^#fn:/).test(hash);
+          let selector = hash.includes(":") ? hash.replace(/\:/g, "\\:") : hash;
           let target = $(selector);
 
           if (target.length) {

_sass/addon/commons.scss

@@ -319,10 +319,10 @@ footer {
 .reversefootnote {
   @at-root a#{&} {
     font-size: 0.6rem;
-    position: absolute;
     line-height: 1;
-    padding-top: 0.5em;
-    margin-left: 0.5em;
+    position: relative;
+    bottom: 0.25em;
+    margin-left: 0.25em;
     border-bottom-style: none !important;
   }
 }