/* https://grabient.com/_feFf3UhargxcgaihWMgBfgBogBggN-gMsgHQ */

background: linear-gradient(90deg, #51176d 0.000%, #7f4154 16.667%, #a7694a 33.333%, #c78f4d 50.000%, #e0b05f 66.667%, #f2ce7f 83.333%, #fbe8ac 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_feFf3UhargxcgaihWMgBfgBogBggN-gMsgHQ -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#51176d" /><stop offset="0.167" stop-color="#7f4154" /><stop offset="0.333" stop-color="#a7694a" /><stop offset="0.500" stop-color="#c78f4d" /><stop offset="0.667" stop-color="#e0b05f" /><stop offset="0.833" stop-color="#f2ce7f" /><stop offset="1.000" stop-color="#fbe8ac" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#51176d", "#7f4154", "#a7694a", "#c78f4d", "#e0b05f", "#f2ce7f", "#fbe8ac"]

// https://grabient.com/_feFf3UhargxcgaihWMgBfgBogBggN-gMsgHQ
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 90.0;

vec3 palette(float t) {
    vec3 a = vec3(-2.171, -0.556, 5.803);
    vec3 b = vec3(3.164, 1.698, 5.516);
    vec3 c = vec3(0.095, 0.104, 0.096);
    vec3 d = vec3(0.894, 0.812, 0.464);
    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);
}

[
  [-2.171, -0.556, 5.803],
  [3.164, 1.698, 5.516],
  [0.095, 0.104, 0.096],
  [0.894, 0.812, 0.464]
]

Gradient palette editor — #51176d to #fbe8ac