nightTab/css/background.css

.background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: var(--z-index-background);
  animation: appear var(--animation-speed-slow) 1;
}

.background-image {
  background-image: var(--background-image);
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: block;
  opacity: var(--background-opacity);
  /* filter: blur(var(--background-blur)) grayscale(var(--background-grayscale)); */
}

.background-accent {
  background-color: rgba(var(--accent), var(--background-accent-opacity));
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: block;
}

@keyframes appear {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}