:root {
  --color-bg: #000;
  --color-fg: #7df9ff;
  --color-shadow-light: #00ffff;
  --color-shadow-deep: #0080ff;
  --font-size: 12px;
  --line-height: 12px;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background: var(--color-bg);
  color: var(--color-fg);
  overflow: hidden;
  font-family: 'Courier New', Courier, monospace;
}

#donut {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: transparent;
  font-size: var(--font-size);
  line-height: var(--line-height);
  text-shadow:
    0 0 8px var(--color-shadow-light),
    0 0 16px var(--color-shadow-deep);
  user-select: none;
}