:root { color-scheme: light dark; background: #f9f7f2; }
@media (prefers-color-scheme: dark) {
  :root { background: #202321; }
}
* { box-sizing: border-box; }
html, body, main { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body { overscroll-behavior: none; }
canvas { display: block; width: 100%; height: 100%; touch-action: none; }
::selection { background: transparent; }