Firework Burst Loader
A flash at the center, twelve sparks streak out in alternating hues and fizzle, and a smaller shell follows half a beat later. Fast out, slow fade. Fits celebratory waits like publishing.
Also known as: fireworks animation css, burst loader, explosion animation.
HTML
<div class="ldr-firework" role="status" aria-label="Loading"> <span style="--i: 0"></span><span style="--i: 1"></span><span style="--i: 2"></span><span style="--i: 3"></span> <span style="--i: 4"></span><span style="--i: 5"></span><span style="--i: 6"></span><span style="--i: 7"></span> <span style="--i: 8"></span><span style="--i: 9"></span><span style="--i: 10"></span><span style="--i: 11"></span> </div>
CSS
.ldr-firework {
--s: var(--ldr-size, 48px);
--c: var(--ldr-color, #3b82f6);
position: relative;
width: var(--s);
height: var(--s);
filter: drop-shadow(0 0 calc(var(--s) / 20) color-mix(in srgb, var(--ldr-color, #3b82f6) 70%, transparent));
}
.ldr-firework::before {
content: "";
position: absolute;
inset: 34%;
border-radius: 50%;
background: radial-gradient(closest-side, color-mix(in srgb, var(--c) 40%, #fff), var(--c) 45%, transparent);
animation: ldr-firework-flash 1.8s ease-out infinite;
}
.ldr-firework span {
position: absolute;
top: 50%;
left: 50%;
width: calc(var(--s) * 0.06);
height: calc(var(--s) * 0.2);
margin: calc(var(--s) * -0.2) 0 0 calc(var(--s) * -0.03);
transform-origin: 50% 100%;
transform: rotate(calc(var(--i) * 30deg));
}
.ldr-firework span::before,
.ldr-firework span::after {
content: "";
position: absolute;
inset: 0;
border-radius: calc(var(--s) * 0.03);
background: linear-gradient(var(--k, var(--c)), transparent);
opacity: 0;
animation: ldr-firework-burst 1.8s cubic-bezier(0.1, 0.75, 0.3, 1) infinite;
}
.ldr-firework span::after {
--k: oklch(from var(--c) l c calc(h - 60));
transform-origin: 50% 100%;
rotate: 15deg;
scale: 0.7;
animation-delay: -0.9s;
}
.ldr-firework span:nth-child(odd) {
--k: oklch(from var(--c) l c calc(h + 70));
}
@keyframes ldr-firework-flash {
0% { transform: scale(0.2); opacity: 1; }
25%, 100% { transform: scale(1.4); opacity: 0; }
}
@keyframes ldr-firework-burst {
0% { transform: translateY(0) scaleY(0.2); opacity: 0; }
6% { opacity: 1; }
50% { transform: translateY(calc(var(--s) * -0.24)) scaleY(1); opacity: 1; }
100% { transform: translateY(calc(var(--s) * -0.3)) scaleY(0.1); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
.ldr-firework, .ldr-firework *, .ldr-firework::before, .ldr-firework::after, .ldr-firework *::before, .ldr-firework *::after {
animation-duration: 3s;
}
}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.