html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #090015;
  overflow: hidden;
  touch-action: manipulation;
  font-family: Arial, Helvetica, sans-serif;
}
#game {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
canvas {
  display: block;
}