Aurora Borealis Flow
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Aurora Borealis Flow</title>
<style>
:root {
/* Configuration Colors */
--bg-color: #020111;
--aurora-1: #00ffcc;
--aurora-2: #0066ff;
--aurora-3: #9900ff;
--animation-speed: 20s;
}
body {
margin: 0;
overflow: hidden;
background-color: var(--bg-color);
background-image: radial-gradient(circle at 50% 10%, rgba(2, 1, 17, 1) 0%, rgba(0, 0, 0, 1) 100%);
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
.stars {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-image:
radial-gradient(2px 2px at 20px 30px, #eee, rgba(0, 0, 0, 0)),
radial-gradient(2px 2px at 40px 70px, #fff, rgba(0, 0, 0, 0)),
radial-gradient(2px 2px at 50px 160px, #ddd, rgba(0, 0, 0, 0)),
radial-gradient(2px 2px at 90px 40px, #fff, rgba(0, 0, 0, 0)),
radial-gradient(2px 2px at 130px 80px, #fff, rgba(0, 0, 0, 0)),
radial-gradient(2px 2px at 160px 120px, #ddd, rgba(0, 0, 0, 0));
background-repeat: repeat;
background-size: 200px 200px;
opacity: 0.3;
}
.aurora-container {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
overflow: hidden;
filter: blur(60px);
opacity: 0.7;
transform: translateZ(0);
/* Hardware acceleration */
}
.aurora-blob {
position: absolute;
border-radius: 50%;
animation: flow var(--animation-speed) infinite alternate ease-in-out;
mix-blend-mode: screen;
}
.blob-1 {
width: 80vw;
height: 60vh;
background: var(--aurora-1);
top: -20vh;
left: -10vw;
transform-origin: center right;
animation-duration: calc(var(--animation-speed) * 0.8);
}
.blob-2 {
width: 70vw;
height: 70vh;
background: var(--aurora-2);
top: 10vh;
right: -20vw;
transform-origin: center left;
animation-duration: calc(var(--animation-speed) * 1.2);
animation-delay: -5s;
}
.blob-3 {
width: 90vw;
height: 50vh;
background: var(--aurora-3);
bottom: -10vh;
left: 20vw;
transform-origin: top center;
animation-duration: var(--animation-speed);
animation-delay: -10s;
}
@keyframes flow {
0% {
transform: scale(1) translate(0px, 0px) rotate(0deg);
}
33% {
transform: scale(1.2) translate(50px, -50px) rotate(10deg);
}
66% {
transform: scale(0.9) translate(-50px, 50px) rotate(-5deg);
}
100% {
transform: scale(1.1) translate(20px, -20px) rotate(5deg);
}
}
@media (prefers-reduced-motion: reduce) {
.aurora-blob { animation: none; }
}
</style>
</head>
<body>
<div class="stars"></div>
<div class="aurora-container">
<div class="aurora-blob blob-1"></div>
<div class="aurora-blob blob-2"></div>
<div class="aurora-blob blob-3"></div>
</div>
</body>
</html>About this animation
Three blurred CSS colour blobs in teal, blue and violet drift and blend behind a static starfield, simulating flowing northern lights.
Under the hood
Blurred CSS Aurora Blobs
Pure CSS with no canvas or animation script: three oversized
.aurora-blob divs in teal #00ffcc, blue #0066ff and violet #9900ff sit inside a container with filter: blur(60px) and mix-blend-mode: screen, so their colours bleed together into aurora curtains. Each blob loops the same @keyframes flow animation of scale, translate and rotate at a different duration derived from --animation-speed: 20s (16s, 24s and 20s, with -5s and -10s delays on two of them), while a repeating tiled radial-gradient starfield sits static behind them.Related
