body {
  margin: 0;
  font-family: 'Arial', sans-serif;
  background: black;
  overflow: hidden;
  color: white;
  text-align: center;
}
#menu, #endScreen {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
button {
  padding: 10px 20px;
  font-size: 1.2em;
  border: none;
  background: cyan;
  color: black;
  box-shadow: 0 0 10px cyan, 0 0 20px cyan;
  cursor: pointer;
}
canvas {
  display: none;
  background: linear-gradient(to bottom, #111, #222);
}