html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #1a1a1a;
  overflow: hidden;
}

#game-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  position: relative;
}

#game {
  background: #6495ed; /* cornflower blue, like GraphicsDevice.Clear */
  max-width: 100vw;
  max-height: 100vh;
  aspect-ratio: 4 / 3;
  outline: none;
}

#loading {
  position: absolute;
  color: #fff;
  font: 24px Arial, sans-serif;
  text-shadow: 0 2px 4px rgba(0,0,0,.6);
  pointer-events: none;
}