*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: #f2f2f7;
  color: #1c1c1e;
  font-family: system-ui, -apple-system, sans-serif;
  overflow: hidden;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  padding: 0.75rem 1rem;
}

header a {
  color: #8e8e93;
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

header a:hover {
  color: #007aff;
}

main {
  width: 100%;
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}