canvas {
  background: #fff;
  border: 1px solid #aaa;
  float: left;
  width: 800px;
  height: 500px;
  border-radius: 4px;
  cursor: crosshair;

  /* Required for correct mouse movement coordinates in JS */
  position: relative;
  left: 0;
  top: 0;
}

h1,
h2,
p,
li {
  font-family: sans-serif;
}

h1 {
  color: #333;
  font-size: 1.5rem;
  font-weight: normal;
  margin: 0 0 15px;
}

h2 {
  color: #333;
  font-size: 1.25rem;
  font-weight: normal;
  margin: 0 0 10px;
}

p {
  color: #333;
  font-size: 14px;
  margin: 0 0 5px;
}

ol {
  margin-left: 16px;
}

ol li {
  color: #333;
  font-size: 14px;
}

ul {
  margin: 0;
  padding: 0;
}

ul li {
  color: #333;
  background: #f3f3f3;
  font-size: 14px;
  list-style: none;
  cursor: pointer;
  border-radius: 4px;
  margin: 0 0 10px;
  padding: 10px;
  user-select: none;
}

li img {
  margin-right: 4px;
}

ul li:hover,
ul li.active {
  background: #ddd;
}

a {
  color: #333;
  text-decoration: none;
  border-bottom: 2px solid #ddd;
}