body {
  max-width: 540px;
  margin: auto;
  padding: 1em;
}

li {
  font-family: sans-serif;
  font-size: 1.5em;
}

#canvas {
  width: 100%;
}

#canvas:hover {
  cursor: pointer;
}

footer > ul > li {
  line-height: 1.5em;
}