html, body {
  margin: 0;
  padding: 0;
  background: #f7f7f7;
  color: #535353;
  font-family: 'Courier New', monospace;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  user-select: none;
}

body { padding: 24px 0; }

h1 {
  font-size: 14px;
  letter-spacing: 0.3em;
  margin: 0 0 16px;
  color: #8a8a8a;
  text-transform: uppercase;
}

canvas {
  background: #f7f7f7;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  display: block;
  max-width: 100%;
  height: auto;
}

.hint {
  margin-top: 14px;
  font-size: 13px;
  color: #8a8a8a;
  text-align: center;
}

.hint kbd {
  background: #fff;
  border: 1px solid #ccc;
  box-shadow: 0 1px 0 #ccc;
  padding: 1px 7px;
  border-radius: 3px;
  font-family: inherit;
  color: #535353;
  margin: 0 2px;
}