body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #222;
  font-family: 'Arial', sans-serif;
}
canvas {
  display: block;
  margin: 0 auto;
  background: url('../img/background.png') repeat-x;
  background-size: cover;
}
#score {
  position: absolute;
  top: 10px;
  left: 20px;
  font-size: 24px;
  color: white;
  z-index: 10;
}