DiffViewer.css

.glow-box {
  border: 2px solid transparent;
  border-radius: 12px;
  transition: box-shadow 0.3s ease-in-out;
}

.glow-dark {
  box-shadow:
    0 0 10px #8a2be2,
    0 0 20px #ff00ff,
    0 0 30px #00ffff;
  animation: glowDarkAnim 2s infinite alternate;
}

.glow-light {
  box-shadow:
    0 0 8px #00bcd4,
    0 0 16px #2196f3,
    0 0 24px #4caf50;
  animation: glowLightAnim 2s infinite alternate;
}

@keyframes glowDarkAnim {
  0% {
    box-shadow: 0 0 10px #ff00ff, 0 0 20px #ff00ff;
  }
  50% {
    box-shadow: 0 0 20px #00ffff, 0 0 30px #00ffff;
  }
  100% {
    box-shadow: 0 0 10px #ff00ff, 0 0 20px #ff00ff;
  }
}

@keyframes glowLightAnim {
  0% {
    box-shadow: 0 0 10px #4caf50, 0 0 20px #2196f3;
  }
  50% {
    box-shadow: 0 0 20px #00bcd4, 0 0 30px #4caf50;
  }
  100% {
    box-shadow: 0 0 10px #2196f3, 0 0 20px #00bcd4;
  }
}