body {
  margin: 0;
  height: 100vh;
  overflow: hidden;

  /* Horizontal split */
  background:
    #060e1b
}

/* Starfield canvas stays on top */
#canvas {
  width: 100vw;
  height: 100vh; /* full page */
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
}