:root{width:100%;height:100%}body{width:100%;height:100%;margin:0;background-color:#d3d3d3;display:flex;flex-direction:column;align-items:center;justify-content:center}#app{position:relative}#canvas{background-color:#fff}#help{display:flex;gap:1em}#help .key{display:inline-block;background-color:#fff;padding:0 .25em;border-radius:.25em;border:solid 1px darkgray}