Rainbow deep violet to midnight blue to deep green to chocolate brown gradient palette editor

/* https://grabient.com/_gC2gCugC9gC2gC6gDrgQOgSdgPjgCigHNgM0 */

background: linear-gradient(90deg, #47004a 0.000%, #17126c 16.667%, #004953 33.333%, #1b5918 50.000%, #4b2d00 66.667%, #5c000d 83.333%, #3d0f48 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gC2gCugC9gC2gC6gDrgQOgSdgPjgCigHNgM0 -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#47004a" /><stop offset="0.167" stop-color="#17126c" /><stop offset="0.333" stop-color="#004953" /><stop offset="0.500" stop-color="#1b5918" /><stop offset="0.667" stop-color="#4b2d00" /><stop offset="0.833" stop-color="#5c000d" /><stop offset="1.000" stop-color="#3d0f48" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#47004a", "#17126c", "#004953", "#1b5918", "#4b2d00", "#5c000d", "#3d0f48"]

// https://grabient.com/_gC2gCugC9gC2gC6gDrgQOgSdgPjgCigHNgM0
// 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(0.182, 0.174, 0.189);
    vec3 b = vec3(0.182, 0.186, 0.235);
    vec3 c = vec3(1.038, 1.181, 0.995);
    vec3 d = vec3(0.162, 0.461, 0.820);
    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);
}

[
  [0.182, 0.174, 0.189],
  [0.182, 0.186, 0.235],
  [1.038, 1.181, 0.995],
  [0.162, 0.461, 0.820]
]