body {
  margin: 0;
  font-family: 'Arial', sans-serif;
  text-align: center;
  background-color: #222;
  color: white;
}

#game {
  margin: 20px auto;
  width: 800px;
  background: #000;
  border: 4px solid #444;
}

canvas {
  display: block;
  background: url('assets/background.png') repeat-x;
  background-size: cover;
}