body{background:#000;margin:0;overflow:hidden;font-size:18px}body .canvas-container{width:100vw;height:100vh;position:relative;background:#bcf5ff}body .canvas-container canvas{position:absolute;top:0;right:0;bottom:0;left:0}body button{position:fixed;top:.5rem;left:.5rem;border:2px solid #fff;border-radius:5px;background:#4c73b4;color:#fff;font-family:monospace;font-weight:100;font-size:1rem;padding:.25rem 1rem;cursor:pointer;z-index:1}body button:focus{outline:none}