/* https://grabient.com/_gLKgFxgA9gEvgE0gBfgHogI0gTzgKIgIJgKG?style=linearGradient&steps=7&angle=180 */

background: linear-gradient(180deg, #881001 0.000%, #ac231f 16.667%, #d34a26 33.333%, #f2780b 50.000%, #ff9d00 66.667%, #ffad08 83.333%, #e9a224 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gLKgFxgA9gEvgE0gBfgHogI0gTzgKIgIJgKG?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="#881001" /><stop offset="0.167" stop-color="#ac231f" /><stop offset="0.333" stop-color="#d34a26" /><stop offset="0.500" stop-color="#f2780b" /><stop offset="0.667" stop-color="#ff9d00" /><stop offset="0.833" stop-color="#ffad08" /><stop offset="1.000" stop-color="#e9a224" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#881001", "#ac231f", "#d34a26", "#f2780b", "#ff9d00", "#ffad08", "#e9a224"]

// https://grabient.com/_gLKgFxgA9gEvgE0gBfgHogI0gTzgKIgIJgKG?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(0.714, 0.369, 0.061);
    vec3 b = vec3(0.303, 0.308, 0.095);
    vec3 c = vec3(0.488, 0.564, 1.267);
    vec3 d = vec3(0.648, 0.521, 0.646);
    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);
}

[
  [0.714, 0.369, 0.061],
  [0.303, 0.308, 0.095],
  [0.488, 0.564, 1.267],
  [0.648, 0.521, 0.646]
]

Gradient palette editor — #881001 to #e9a224