okay preact is actually pretty cool tbh. (now using it for copy to clipboard buttons)

assets/sass/components/_syntax.scss

@@ -34,6 +34,7 @@ div.highlight {
   overflow-x: scroll;
   margin: 1em 0;
   border: 1px solid;
+  position: relative;
 
   pre {
     padding-left: 1.5em;
@@ -44,23 +45,15 @@ div.highlight {
   > pre > code {
     padding-right: 1.5em;
   }
-}
-
-// elements dynamically added by clipboard.js code
-div.highlight-clipboard-enabled {
-  position: relative;
 
   button.copy-button {
     position: absolute;
     top: 0;
     right: 0;
-    width: 5.5em;
-    padding: 0.75em 0.25em;
-    border: 1px solid;
+    padding: 0.75em;
+    border-width: 0 0 1px 1px;
+    border-style: solid;
     cursor: pointer;
-    font-size: 0.85em;
-    font-weight: 500;
-    line-height: 1;
 
     &:hover {
       @include themes.themed(
@@ -69,6 +62,11 @@ div.highlight-clipboard-enabled {
         )
       );
     }
+
+    .octicon {
+      width: 1em;
+      height: 1em;
+    }
   }
 }
 
@@ -110,9 +108,6 @@ div.highlight-clipboard-enabled {
   }
 
   .kd,
-  // .nb,
-  // .nl,
-  // .nv,
   .vc,
   .vg,
   .vi,