html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #0b0b12;
  color: #c8c8d8;
  font-family: "Courier New", monospace;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

#frame {
  text-align: center;
}

#screen {
  /* Internal resolution is 256x240; scale up with crisp pixels. */
  width: 768px;
  height: 720px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
  border: 4px solid #2a2a3a;
  box-shadow: 0 0 0 4px #11111a, 0 12px 40px rgba(0, 0, 0, 0.6);
}

#hint {
  margin: 14px 0 0;
  font-size: 13px;
  letter-spacing: 1px;
  color: #6c6c84;
}