*,:before,:after{box-sizing:border-box}body{color:#fff;background:#000;border:0;flex-flow:column;width:100vw;height:100vh;margin:0;padding:0;display:flex}button{color:#000;opacity:1;cursor:pointer;background:#fff;border:none;border-radius:5px;box-shadow:1px 1px 1px #2f4f4f}button:active{background:#499fff}