html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #111320;
  font-family: Arial, sans-serif;
}

#game-container {
  width: 100%;
  height: 100%;
}

#game-container canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
}