/* https://grabient.com/_gKMgGsgeYgF5gEfgekgISgHzgBfgI5gGpgGZ?style=linearGradient&steps=6&angle=180 */

background: linear-gradient(180deg, #4f2c4c 0.000%, #7b252f 20.000%, #b93918 40.000%, #ef6108 60.000%, #ff8e00 80.000%, #f4ae00 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gKMgGsgeYgF5gEfgekgISgHzgBfgI5gGpgGZ?style=linearGradient&steps=6&angle=180 -->
            <defs>
              <linearGradient id="gradient" x1="0.500" y1="0.000" x2="0.500" y2="1.000">
        <stop offset="0.000" stop-color="#4f2c4c" /><stop offset="0.200" stop-color="#7b252f" /><stop offset="0.400" stop-color="#b93918" /><stop offset="0.600" stop-color="#ef6108" /><stop offset="0.800" stop-color="#ff8e00" /><stop offset="1.000" stop-color="#f4ae00" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#4f2c4c", "#7b252f", "#b93918", "#ef6108", "#ff8e00", "#f4ae00"]

// https://grabient.com/_gKMgGsgeYgF5gEfgekgISgHzgBfgI5gGpgGZ?style=linearGradient&steps=6&angle=180
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 6.0;
const float ANGLE = 180.0;

vec3 palette(float t) {
    vec3 a = vec3(0.652, 0.428, 1.944);
    vec3 b = vec3(0.377, 0.287, 1.956);
    vec3 c = vec3(0.530, 0.499, 0.095);
    vec3 d = vec3(0.569, 0.425, 0.409);
    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);
}

[
  [0.652, 0.428, 1.944],
  [0.377, 0.287, 1.956],
  [0.530, 0.499, 0.095],
  [0.569, 0.425, 0.409]
]

Gradient palette editor — #4f2c4c to #f4ae00