Gradient palette editor — #3e2071 to #e9696e

/* https://grabient.com/_gJAgD9gJJgFWgD_gCagG3gHbgQ0gIXgKbgGy?style=linearGradient&steps=7&angle=270 */

background: linear-gradient(270deg, #3e2071 0.000%, #4f3f77 16.667%, #6e5ea0 33.333%, #9576bc 50.000%, #bc81ac 66.667%, #da7d82 83.333%, #e9696e 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gJAgD9gJJgFWgD_gCagG3gHbgQ0gIXgKbgGy?style=linearGradient&steps=7&angle=270 -->
            <defs>
              <linearGradient id="gradient" x1="1.000" y1="0.500" x2="0.000" y2="0.500">
        <stop offset="0.000" stop-color="#3e2071" /><stop offset="0.167" stop-color="#4f3f77" /><stop offset="0.333" stop-color="#6e5ea0" /><stop offset="0.500" stop-color="#9576bc" /><stop offset="0.667" stop-color="#bc81ac" /><stop offset="0.833" stop-color="#da7d82" /><stop offset="1.000" stop-color="#e9696e" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#3e2071", "#4f3f77", "#6e5ea0", "#9576bc", "#bc81ac", "#da7d82", "#e9696e"]

// https://grabient.com/_gJAgD9gJJgFWgD_gCagG3gHbgQ0gIXgKbgGy?style=linearGradient&steps=7&angle=270
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 270.0;

vec3 palette(float t) {
    vec3 a = vec3(0.576, 0.253, 0.585);
    vec3 b = vec3(0.342, 0.255, 0.154);
    vec3 c = vec3(0.439, 0.475, 1.076);
    vec3 d = vec3(0.535, 0.667, 0.434);
    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);
}

[
  [0.576, 0.253, 0.585],
  [0.342, 0.255, 0.154],
  [0.439, 0.475, 1.076],
  [0.535, 0.667, 0.434]
]