html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background-color: #87CEEB;
  font-family: sans-serif;
}

canvas { display: block; }

#score {
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 24px;
  color: #fff;
  text-shadow: 1px 1px 4px #000;
  z-index: 10;
}