* { margin:0; padding:0; box-sizing:border-box; }
html,body { width:100%; height:100%; overflow:hidden; background:#000; touch-action:none; -webkit-touch-callout:none; -webkit-user-select:none; }
body { display:flex; justify-content:center; align-items:center; }
canvas { display:block; image-rendering:auto; touch-action:none; user-select:none; }