/* https://grabient.com/_gK8gE6gBFgCDgDEgAZgJsgISgLXgL-gK3gHv?style=linearGradient&steps=7&angle=180 */

background: linear-gradient(180deg, #b63f0b 0.000%, #c95a0d 16.667%, #d37311 33.333%, #d08016 50.000%, #c18018 66.667%, #ac7117 83.333%, #995813 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gK8gE6gBFgCDgDEgAZgJsgISgLXgL-gK3gHv?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="#b63f0b" /><stop offset="0.167" stop-color="#c95a0d" /><stop offset="0.333" stop-color="#d37311" /><stop offset="0.500" stop-color="#d08016" /><stop offset="0.667" stop-color="#c18018" /><stop offset="0.833" stop-color="#ac7117" /><stop offset="1.000" stop-color="#995813" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#b63f0b", "#c95a0d", "#d37311", "#d08016", "#c18018", "#ac7117", "#995813"]

// https://grabient.com/_gK8gE6gBFgCDgDEgAZgJsgISgLXgL-gK3gHv?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(0.700, 0.314, 0.069);
    vec3 b = vec3(0.131, 0.196, 0.025);
    vec3 c = vec3(0.620, 0.530, 0.727);
    vec3 d = vec3(0.766, 0.695, 0.495);
    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);
}

[
  [0.700, 0.314, 0.069],
  [0.131, 0.196, 0.025],
  [0.620, 0.530, 0.727],
  [0.766, 0.695, 0.495]
]

Gradient palette editor — #b63f0b to #995813