html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #000;
}

canvas {
  display: block;
  width: 100vw;
  height: 100vh;
}

#tapButton {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 20%;
  background: transparent;
  z-index: 5;
}

#playAgainButton {
  display: none;
  position: fixed;
  left: 50%;
  top: 60%;
  transform: translateX(-50%);
  font-size: 24px;
  padding: 10px 20px;
  background-color: #000;
  color: #fff;
  border: none;
  border-radius: 8px;
  z-index: 10;
}