html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #dce8f2;
  font-family: Arial, Helvetica, sans-serif;
}
#game {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 50% 35%, #f0f8ff 0%, #dce8f2 54%, #c9d8e4 100%);
}
canvas {
  display: block;
  outline: none;
  image-rendering: auto;
  transform: translateZ(0);
  filter: contrast(1.04) saturate(1.04);
  backface-visibility: hidden;
}