Rainbow deep violet to marine blue to spruce to chocolate brown gradient palette editor

/* https://grabient.com/_gC2gCugC9gC2gC6gDrgQOgSdgPjgCigHNgM0?style=linearGradient&steps=8&angle=225 */

background: linear-gradient(225deg, #47004a 0.000%, #1d0c6a 14.286%, #023b60 28.571%, #0a5b32 42.857%, #304c02 57.143%, #551c00 71.429%, #5a0014 85.714%, #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?style=linearGradient&steps=8&angle=225 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.146" x2="0.146" y2="0.854">
        <stop offset="0.000" stop-color="#47004a" /><stop offset="0.143" stop-color="#1d0c6a" /><stop offset="0.286" stop-color="#023b60" /><stop offset="0.429" stop-color="#0a5b32" /><stop offset="0.571" stop-color="#304c02" /><stop offset="0.714" stop-color="#551c00" /><stop offset="0.857" stop-color="#5a0014" /><stop offset="1.000" stop-color="#3d0f48" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#47004a", "#1d0c6a", "#023b60", "#0a5b32", "#304c02", "#551c00", "#5a0014", "#3d0f48"]

// https://grabient.com/_gC2gCugC9gC2gC6gDrgQOgSdgPjgCigHNgM0?style=linearGradient&steps=8&angle=225
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 8.0;
const float ANGLE = 225.0;

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]
]