/* https://grabient.com/_gITgC4gAPgHugDzgASgHIgFWgQ3gKSgK0gIk?style=linearGradient&steps=7&angle=315 */

background: linear-gradient(315deg, #431900 0.000%, #7b2f03 16.667%, #b64408 33.333%, #e65708 50.000%, #ff6503 66.667%, #ff6c00 83.333%, #e66b01 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gITgC4gAPgHugDzgASgHIgFWgQ3gKSgK0gIk?style=linearGradient&steps=7&angle=315 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.854" x2="0.146" y2="0.146">
        <stop offset="0.000" stop-color="#431900" /><stop offset="0.167" stop-color="#7b2f03" /><stop offset="0.333" stop-color="#b64408" /><stop offset="0.500" stop-color="#e65708" /><stop offset="0.667" stop-color="#ff6503" /><stop offset="0.833" stop-color="#ff6c00" /><stop offset="1.000" stop-color="#e66b01" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#431900", "#7b2f03", "#b64408", "#e65708", "#ff6503", "#ff6c00", "#e66b01"]

// https://grabient.com/_gITgC4gAPgHugDzgASgHIgFWgQ3gKSgK0gIk?style=linearGradient&steps=7&angle=315
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 315.0;

vec3 palette(float t) {
    vec3 a = vec3(0.531, 0.184, 0.015);
    vec3 b = vec3(0.494, 0.243, 0.018);
    vec3 c = vec3(0.456, 0.342, 1.079);
    vec3 d = vec3(0.658, 0.692, 0.548);
    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);
}

[
  [0.531, 0.184, 0.015],
  [0.494, 0.243, 0.018],
  [0.456, 0.342, 1.079],
  [0.658, 0.692, 0.548]
]

Gradient palette editor — #431900 to #e66b01