*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; background: #000; color: #ddd; font: 13px/1.3 ui-monospace, Menlo, Consolas, monospace; overscroll-behavior: none; }
button, input { font: inherit; color: inherit; background: none; border: 0; }
button { cursor: pointer; }
canvas { display: block; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }