Hide scrollbar of sidebar

_sass/addon/commons.scss

@@ -603,6 +603,15 @@ $sidebar-display: "sidebar-display";
   z-index: 99;
   background: var(--sidebar-bg);
 
+  /* Hide scrollbar for Chrome, Safari and Opera */
+  &::-webkit-scrollbar {
+    display: none;
+  }
+
+  /* Hide scrollbar for IE, Edge and Firefox */
+  -ms-overflow-style: none;  /* IE and Edge */
+  scrollbar-width: none;  /* Firefox */
+
   a {
     @include sidebar-links;