* {
  margin: 0;
  padding: 0;
}
html {
  height: 100%;
}
body {
  background: -webkit-linear-gradient(top, #7fc5c9, #deabbe);
  text-align: center;
}
.score {
  margin-bottom: 20px;
  font-family: verdana;
  font-size: 2em;
  color: #fff;
}
canvas {
  margin: auto;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
}