:root {
  --mode-bg-light: #fff;
  --mode-bg-dark: #252528;
}

.dark-to-light:after {
  content: '';
  width: 100vw;
  height: 100vh;
  position: fixed;
  z-index: 99999;
  left: 0;
  top: 0;
  margin-left: 0;
  background-color: var(--mode-bg-dark);
  opacity: 0.7;
  animation: toLight 0.6s linear 0s forwards;
  pointer-events: none;
}

.light-to-dark:after {
  content: '';
  width: 100vw;
  height: 100vh;
  position: fixed;
  z-index: 99999;
  left: 0;
  top: 0;
  margin-left: 0;
  background-color: var(--mode-bg-light);
  opacity: 0.7;
  animation: toDark 0.6s linear 0s forwards;
  pointer-events: none;
}

@keyframes toLight {
  0% {
    background-color: var(--mode-bg-dark);
    opacity: 0.7;
  }

  100% {
    background-color: var(--mode-bg-light);
    opacity: 0;
  }
}

@keyframes toDark {
  0% {
    background-color: var(--mode-bg-light);
    opacity: 0.7;
  }

  100% {
    background-color: var(--mode-bg-dark);
    opacity: 0;
  }
}