/* https://grabient.com/_gJpg_VgBSgGOg-dgBmgGsgBmgSggJtgHrgIo?style=linearGradient&steps=7&angle=180 */
background: linear-gradient(180deg, #541000 0.000%, #791015 16.667%, #a61b2d 33.333%, #d13225 50.000%, #f25407 66.667%, #ff8000 83.333%, #feb713 100.000%);
<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
<!-- https://grabient.com/_gJpg_VgBSgGOg-dgBmgGsgBmgSggJtgHrgIo?style=linearGradient&steps=7&angle=180 -->
<defs>
<linearGradient id="gradient" x1="0.500" y1="0.000" x2="0.500" y2="1.000">
<stop offset="0.000" stop-color="#541000" /><stop offset="0.167" stop-color="#791015" /><stop offset="0.333" stop-color="#a61b2d" /><stop offset="0.500" stop-color="#d13225" /><stop offset="0.667" stop-color="#f25407" /><stop offset="0.833" stop-color="#ff8000" /><stop offset="1.000" stop-color="#feb713" />
</linearGradient>
</defs>
<rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
</svg>
["#541000", "#791015", "#a61b2d", "#d13225", "#f25407", "#ff8000", "#feb713"]
// https://grabient.com/_gJpg_VgBSgGOg-dgBmgGsgBmgSggJtgHrgIo?style=linearGradient&steps=7&angle=180
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 180.0;
vec3 palette(float t) {
vec3 a = vec3(0.617, 4.053, 0.082);
vec3 b = vec3(0.398, 3.997, 0.102);
vec3 c = vec3(0.428, 0.102, 1.184);
vec3 d = vec3(0.621, 0.491, 0.552);
return a + b * cos(6.283185 * (c * t + d));
}
// N stops sampled from the palette, blended like the CSS gradient
vec3 stops(float t) {
float n = STEPS - 1.0;
float x = clamp(t, 0.0, 1.0) * n;
return mix(palette(floor(x) / n), palette(min(floor(x) + 1.0, n) / n), fract(x));
}
void mainImage(out vec4 fragColor, in vec2 fragCoord) {
vec2 p = fragCoord - 0.5 * iResolution.xy;
// CSS angle: 0 = up, clockwise; span = CSS gradient-line length
vec2 dir = vec2(sin(radians(ANGLE)), cos(radians(ANGLE)));
float len = abs(iResolution.x * dir.x) + abs(iResolution.y * dir.y);
float t = dot(p, dir) / len + 0.5;
fragColor = vec4(stops(t), 1.0);
}
[
[0.617, 4.053, 0.082],
[0.398, 3.997, 0.102],
[0.428, 0.102, 1.184],
[0.621, 0.491, 0.552]
]