body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #111;
  color: #eee;
}

nav {
  background: #222;
  padding: 12px;
}

nav a {
  color: #fff;
  margin-right: 15px;
  text-decoration: none;
}

.container {
  padding: 20px;
}

button {
  padding: 10px 14px;
  margin-right: 10px;
}

canvas {
  border: 1px solid #555;
  background: #fff;
  margin-top: 20px;
}

svg {
  background: transparent;
  margin-top: 20px;
}

.stats {
  margin-top: 15px;
  line-height: 1.8;
}

.code {
  background: #222;
  padding: 10px;
  border-radius: 6px;
  font-family: monospace;
}