webui/css/loading-indicators.css

.three-bubble-loader {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-text-muted);
  opacity: 0.58;
  transition: opacity var(--transition-speed) ease;
}

.three-bubble-loader.is-active {
  opacity: 1;
}

.three-bubble-loader-dot {
  --three-bubble-loader-delay: 0s;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.35;
}

.three-bubble-loader.is-active > .three-bubble-loader-dot {
  animation: three-bubble-loader-jump 1.2s ease-in-out infinite;
  animation-delay: var(--three-bubble-loader-delay);
}

.three-bubble-loader-dot:nth-child(2) {
  --three-bubble-loader-delay: 0.16s;
}

.three-bubble-loader-dot:nth-child(3) {
  --three-bubble-loader-delay: 0.32s;
}

.loading-indicator-label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes three-bubble-loader-jump {
  0%,
  55%,
  100% {
    opacity: 0.35;
    transform: translateY(0);
  }
  20% {
    opacity: 1;
    transform: translateY(-0.4rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .three-bubble-loader.is-active > .three-bubble-loader-dot {
    animation: none;
    opacity: 0.7;
  }
}