ar-design/dist/assets/css/components/feedback/loading/loading.css

AR Design is a (react | nextjs) ui library.

.ar-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  inset: 0;
  background-color: rgba(var(--black-rgb), 0.5);
  animation: background 250ms linear 0s 1 normal both;
  z-index: 1051;
}
.ar-loading::before {
  content: "";
  width: 1rem;
  height: 1rem;
  border-radius: var(--border-radius-pill);
  transform: rotate(-135deg);
  animation: spin 1s linear 0s infinite normal both;
}

@keyframes background {
  0% {
    opacity: 0;
    visibility: hidden;
  }
  100% {
    opacity: 1;
    visibility: visible;
  }
}

@keyframes spin {
  0% {
    background-color: var(--white);
  }
  20% {
    box-shadow: -1.25rem -1.25rem 0 0 rgba(var(--warning-rgb), 0.75), 1.25rem -1.25rem 0 0 rgba(var(--white-rgb), 0.75),
      -1.25rem 1.25rem 0 0 rgba(var(--white-rgb), 0.75), 1.25rem 1.25rem 0 0 rgba(var(--white-rgb), 0.75);
  }
  40% {
    box-shadow: -1.25rem 1.25rem 0 0 rgba(var(--warning-rgb), 0.75), 1.25rem -1.25rem 0 0 rgba(var(--white-rgb), 0.75),
      -1.25rem 1.25rem 0 0 rgba(var(--warning-rgb), 0.75), 1.25rem 1.25rem 0 0 rgba(var(--white-rgb), 0.75);
  }
  60% {
    box-shadow: -1.25rem 1.25rem 0 0 rgba(var(--warning-rgb), 0.75), 1.25rem -1.25rem 0 0 rgba(var(--white-rgb), 0.75),
      1.25rem 1.25rem 0 0 rgba(var(--warning-rgb), 0.75), 1.25rem 1.25rem 0 0 rgba(var(--warning-rgb), 0.75);
  }
  80% {
    box-shadow: -1.25rem 1.25rem 0 0 rgba(var(--warning-rgb), 0.75), 1.25rem -1.25rem 0 0 rgba(var(--warning-rgb), 0.75),
      1.25rem 1.25rem 0 0 rgba(var(--warning-rgb), 0.75), 1.25rem -1.25rem 0 0 rgba(var(--warning-rgb), 0.75);
  }
  100% {
    background-color: var(--warning);
  }
}