Eclipse Spinner
A thin crescent sweeps around a faint disc, like the bright edge of an eclipse. The crescent is just an offset box-shadow on a rotating circle, so it is one element with no pseudo parts.
Also known as: crescent spinner, moon spinner, box shadow spinner.
HTML
<div class="ldr-eclipse-spinner" role="status" aria-label="Loading"></div>
CSS
.ldr-eclipse-spinner {
--s: var(--ldr-size, 48px);
--c: var(--ldr-color, #3b82f6);
width: var(--s);
height: var(--s);
border-radius: 50%;
background: color-mix(in srgb, var(--ldr-color, #3b82f6) 10%, transparent);
box-shadow: 0 calc(var(--s) / 12) 0 0 var(--c);
animation: ldr-eclipse-spinner-spin 1s linear infinite;
}
@keyframes ldr-eclipse-spinner-spin {
to { transform: rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
.ldr-eclipse-spinner, .ldr-eclipse-spinner *, .ldr-eclipse-spinner::before, .ldr-eclipse-spinner::after, .ldr-eclipse-spinner *::before, .ldr-eclipse-spinner *::after {
animation-duration: 3s;
}
}Tailwind CSS version
The same loader using only Tailwind's built-in animation utilities. No custom keyframes or config needed.
<div class="h-12 w-12 animate-spin rounded-full bg-blue-500/10 shadow-[0_4px_0_0_#3b82f6]" role="status" aria-label="Loading"></div>
Customizing this loader
- Color: set
--ldr-coloron the element or a parent. Currently previewing#3b82f6. - Size: set
--ldr-size. Every dimension in the snippet is derived from it. Currently previewing64px. - Speed: change the duration on the
animationshorthand. Delays on the children are relative, so they keep their rhythm. - Accessibility: the root carries
role="status"and anaria-labelso screen readers announce the wait. The reduced-motion rule at the end slows the animation for users who asked for less motion.