Rainbow rebecca purple to pine green to dark brown to brown gradient palette editor

/* https://grabient.com/_gE4gDsgEjgFYgDHgFFgMYgPLgLUgCvgKxgOt */

background: linear-gradient(90deg, #772997 0.000%, #315a97 16.667%, #006f6c 33.333%, #00532f 50.000%, #362201 66.667%, #7c0900 83.333%, #a52120 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gE4gDsgEjgFYgDHgFFgMYgPLgLUgCvgKxgOt -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#772997" /><stop offset="0.167" stop-color="#315a97" /><stop offset="0.333" stop-color="#006f6c" /><stop offset="0.500" stop-color="#00532f" /><stop offset="0.667" stop-color="#362201" /><stop offset="0.833" stop-color="#7c0900" /><stop offset="1.000" stop-color="#a52120" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#772997", "#315a97", "#006f6c", "#00532f", "#362201", "#7c0900", "#a52120"]

// https://grabient.com/_gE4gDsgEjgFYgDHgFFgMYgPLgLUgCvgKxgOt
// 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(0.312, 0.236, 0.291);
    vec3 b = vec3(0.344, 0.199, 0.325);
    vec3 c = vec3(0.792, 0.971, 0.724);
    vec3 d = vec3(0.175, 0.689, 0.941);
    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);
}

[
  [0.312, 0.236, 0.291],
  [0.344, 0.199, 0.325],
  [0.792, 0.971, 0.724],
  [0.175, 0.689, 0.941]
]