body{text-align:center;font-family:sans-serif}#keyboard{justify-content:center;margin-top:20px;display:flex}.key{background:#fff;border:1px solid #000;width:40px;height:150px;margin:2px}.key.black{z-index:2;background:#000;width:30px;height:100px;margin-left:-15px;margin-right:-15px;position:relative}