.highlight{position:relative}.code-copy-btn{position:absolute;top:8px;right:8px;padding:4px 8px;font-size:12px;color:#aaa;background:rgba(50,50,50,.8);border:1px solid #555;border-radius:4px;cursor:pointer;opacity:0;transition:opacity .2s,background .2s;z-index:10}.highlight:hover .code-copy-btn{opacity:1}.code-copy-btn:hover{background:rgba(80,80,80,.9);color:#fff}.code-copy-btn.copied{color:#4ade80;border-color:#4ade80}