* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 1.5rem;
  color: #1a1a1a;
  background: #fafafa;
}