restyle zeroclipboard doodad

docs/assets/scss/_zeroclipboard.scss

@@ -7,19 +7,21 @@
   display: none;
   float: right;
 }
+
 .btn-clipboard {
   position: absolute;
-  top: 0;
-  right: 0;
+  top: .5rem;
+  right: .5rem;
   z-index: 10;
   display: block;
   padding: .25rem .5rem;
   font-size: 75%;
   color: #818a91;
   cursor: pointer;
-  background-color: #eceeef;
-  border-radius: 0 .2rem 0 .2rem;
+  background-color: transparent;
+  border-radius: .25rem;
 }
+
 .btn-clipboard-hover {
   color: #fff;
   background-color: #027de7;