style: highlight scrollbar on hover and change scrollbar width as thin

Author: razonyang

assets/hb/modules/code-block-panel/scss/index.scss

@@ -1,4 +1,16 @@
 /*! purgecss start ignore */
 @import "../../../../mods/code-block-panel/scss/index";
 
+.highlight {
+  pre {
+    @include media-breakpoint-up(lg) {
+      scrollbar-width: thin;
+
+      &:hover {
+        scrollbar-color: var(--#{$prefix}primary) transparent;
+      }
+    }
+  }
+}
+
 /*! purgecss end ignore */