body {
  margin: 0;
  font-family: sans-serif;
  background: #111;
  color: #0ff;
  text-align: center;
}
#gameContainer {
  max-width: 320px;
  margin: auto;
  padding: 10px;
}
canvas {
  background: #000;
  display: block;
  margin: auto;
  border: 2px solid #0ff;
}
#nicknameContainer, #score, #lives {
  margin: 10px 0;
}
#rankingContainer {
  background: #222;
  padding: 10px;
  margin-top: 10px;
  border-radius: 10px;
}