.container{display:flex;flex-direction:column;align-items:center;justify-content:center}.button{display:flex;justify-content:center;margin-top:15px}.btn{background-color:#4caf50;border:none;color:#fff;padding:10px 20px;text-align:center;text-decoration:none;display:inline-block;font-size:16px;margin:10px;cursor:pointer;border-radius:5px}.btn:hover{background-color:#3e8e41}.control{text-align:center}canvas{background:#000}