/* https://grabient.com/_gNUgAAgMhgLigAAgKDgBmgBggB-gKEgAAgKI?style=radialSwatches&steps=5&angle=0 */
background: radial-gradient(circle, #65006a 0.000%, #65006a 20.000%, #7e0086 calc(20.000% + 1px), #7e0086 40.000%, #9a00a4 calc(40.000% + 1px), #9a00a4 60.000%, #b700c5 calc(60.000% + 1px), #b700c5 80.000%, #d500e5 calc(80.000% + 1px) 100.000%);
<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
<!-- https://grabient.com/_gNUgAAgMhgLigAAgKDgBmgBggB-gKEgAAgKI?style=radialSwatches&steps=5&angle=0 -->
<defs>
<clipPath id="ringBounds">
<rect x="0" y="0" width="800" height="400" />
</clipPath>
</defs>
<g clip-path="url(#ringBounds)"><path d="M 310.557,200.000 A 89.443,89.443 0 1 1 489.443,200.000 A 89.443,89.443 0 1 1 310.557,200.000 Z" fill="#65006a" fill-opacity="1.000" /><path d="M 221.115,200.000 A 178.885,178.885 0 1 1 578.885,200.000 A 178.885,178.885 0 1 1 221.115,200.000 Z M 310.557,200.000 A 89.443,89.443 0 1 0 489.443,200.000 A 89.443,89.443 0 1 0 310.557,200.000 Z" fill="#7e0086" fill-opacity="1.000" /><path d="M 131.672,200.000 A 268.328,268.328 0 1 1 668.328,200.000 A 268.328,268.328 0 1 1 131.672,200.000 Z M 221.115,200.000 A 178.885,178.885 0 1 0 578.885,200.000 A 178.885,178.885 0 1 0 221.115,200.000 Z" fill="#9a00a4" fill-opacity="1.000" /><path d="M 42.229,200.000 A 357.771,357.771 0 1 1 757.771,200.000 A 357.771,357.771 0 1 1 42.229,200.000 Z M 131.672,200.000 A 268.328,268.328 0 1 0 668.328,200.000 A 268.328,268.328 0 1 0 131.672,200.000 Z" fill="#b700c5" fill-opacity="1.000" /><path d="M -47.214,200.000 A 447.214,447.214 0 1 1 847.214,200.000 A 447.214,447.214 0 1 1 -47.214,200.000 Z M 42.229,200.000 A 357.771,357.771 0 1 0 757.771,200.000 A 357.771,357.771 0 1 0 42.229,200.000 Z" fill="#d500e5" fill-opacity="1.000" /></g>
</svg>
["#65006a", "#7e0086", "#9a00a4", "#b700c5", "#d500e5"]
// https://grabient.com/_gNUgAAgMhgLigAAgKDgBmgBggB-gKEgAAgKI?style=radialSwatches&steps=5&angle=0
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 5.0;
vec3 palette(float t) {
vec3 a = vec3(0.852, 0.000, 0.801);
vec3 b = vec3(0.738, 0.000, 0.643);
vec3 c = vec3(0.102, 0.096, 0.126);
vec3 d = vec3(0.644, 0.000, 0.648);
return a + b * cos(6.283185 * (c * t + d));
}
// N hard swatches sampled from the palette
vec3 stops(float t) {
float i = min(floor(clamp(t, 0.0, 1.0) * STEPS), STEPS - 1.0);
return palette(i / (STEPS - 1.0));
}
void mainImage(out vec4 fragColor, in vec2 fragCoord) {
vec2 p = fragCoord - 0.5 * iResolution.xy;
// circle to the farthest corner (CSS default)
float t = length(p) / length(0.5 * iResolution.xy);
fragColor = vec4(stops(t), 1.0);
}
[
[0.852, 0.000, 0.801],
[0.738, 0.000, 0.643],
[0.102, 0.096, 0.126],
[0.644, 0.000, 0.648]
]