:root{color:#ffffffde;background-color:#242424}.center{display:flex;flex-direction:column;align-items:center}canvas{width:100%;max-width:750px;height:auto}button{border:none;color:#fff;padding:10px;text-align:center;display:inline-block;font-size:14px;margin:4px 2px;cursor:pointer;border-radius:8px}#start{background-color:#4caf50}#reset{background-color:#4c53af}#stop{background-color:#aa1313}