body {
  background-color: #000;
  color: #fff;
  font-family: sans-serif;
  font-size: 16px;
  margin: 0;
  padding: 0;
}

header {
  width: 512px;
  text-align: center;
}
#game {
  border: 1px solid white;
  display: block;
}

#controls {
  width: 512px;
}

#controls label {
  padding-left: 50px;
}

button {
  background-color: #000;
  border: 1px solid white;
  color: #fff;
  cursor: pointer;
  font-size: 16px;
  margin: 0;
  padding: 2px;
  width: 100px;
}