html,
body {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

#juego {
  display: block;
  width: 100%;
  height: 100%;
}