*{box-sizing:border-box;margin:0;padding:0}body{background-color:#fff;width:100vw;height:100vh;display:flex;justify-content:center;align-items:center;flex-direction:column}#canvas{border:1px solid #000}button{margin:20px;padding:10px 20px}#delay{margin:20px 0;width:200px}@media only screen and (max-width:768px){#canvas{width:calc(100vw - 20px);height:calc(100vw - 20px)}#delay{width:calc(100vw - 30px)}}