monkeytype/public/themes/shadow.css

:root {
  --bg-color: #000;
  --main-color: #eee;
  --caret-color: #eee;
  --sub-color: #444;
  --text-color: #eee;
  --error-color: #fff;
  --error-extra-color: #d8d8d8;
  --colorful-error-color: #fff;
  --colorful-error-extra-color: #d8d8d8;
}

@keyframes shadow {
  to {
    color: #000;
  }
}

@keyframes shadow-repeat {
  50% {
    color: #000;
  }
  100% {
    color: #eee;
  }
}

#liveWpm,
#timerNumber {
  color: white;
}

#top .config .group .buttons .text-button.active,
#result .stats .group,
#menu .icon-button:hover,
#top .config .group .buttons .text-button:hover,
a:hover {
  animation-name: shadow-repeat;
  animation-duration: 3s;
  animation-iteration-count: infinite;
  animation-fill-mode: forwards;
  animation-timing-function: linear;
}

#logo,
.word letter.correct {
  animation-name: shadow;
  animation-duration: 5s;
  animation-iteration-count: 1;
  animation-fill-mode: forwards;
  animation-timing-function: linear;
}