Almost black to deep lavender to pig pink gradient palette editor

/* https://grabient.com/_gIAf8FgFsgG4gPhgGdgHcgBpgHigHrgMngKO */

background: linear-gradient(90deg, #131921 0.000%, #1d3252 16.667%, #404a86 33.333%, #7461b0 50.000%, #ab75c5 66.667%, #d888c0 83.333%, #f097a2 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gIAf8FgFsgG4gPhgGdgHcgBpgHigHrgMngKO -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#131921" /><stop offset="0.167" stop-color="#1d3252" /><stop offset="0.333" stop-color="#404a86" /><stop offset="0.500" stop-color="#7461b0" /><stop offset="0.667" stop-color="#ab75c5" /><stop offset="0.833" stop-color="#d888c0" /><stop offset="1.000" stop-color="#f097a2" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#131921", "#1d3252", "#404a86", "#7461b0", "#ab75c5", "#d888c0", "#f097a2"]

// https://grabient.com/_gIAf8FgFsgG4gPhgGdgHcgBpgHigHrgMngKO
// 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(0.512, -0.251, 0.364);
    vec3 b = vec3(0.440, 0.993, 0.413);
    vec3 c = vec3(0.476, 0.105, 0.482);
    vec3 d = vec3(0.491, 0.807, 0.654);
    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);
}

[
  [0.512, -0.251, 0.364],
  [0.440, 0.993, 0.413],
  [0.476, 0.105, 0.482],
  [0.491, 0.807, 0.654]
]