html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #000;
  overflow: hidden;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
}
#screen {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
}
/* subtle CRT scanlines */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.10) 0 1px,
    rgba(0, 0, 0, 0) 1px 3px
  );
}