src/lib/components/Loading.svelte

<div class="absolute left-0 top-0 w-full h-full flex items-center justify-center flex-col gap-3">
  <svg
    class="animate-spin h-8 w-8 text-white"
    xmlns="http://www.w3.org/2000/svg"
    fill="none"
    viewBox="0 0 24 24"
  >
    <circle
      class="opacity-25"
      cx="12"
      cy="12"
      r="10"
      stroke="currentColor"
      stroke-width="4"
    ></circle>
    <path
      class="opacity-75"
      fill="currentColor"
      d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
    ></path>
  </svg>
  <slot />
</div>