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

background: linear-gradient(270deg, #0011f8 0.000%, #1511ea 16.667%, #3f11dc 33.333%, #6911ce 50.000%, #9311c0 66.667%, #be11b2 83.333%, #e811a4 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gJZgBDgMggZBgAAgIWgBkgdZgBjgKpgAAgDG?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="#0011f8" /><stop offset="0.167" stop-color="#1511ea" /><stop offset="0.333" stop-color="#3f11dc" /><stop offset="0.500" stop-color="#6911ce" /><stop offset="0.667" stop-color="#9311c0" /><stop offset="0.833" stop-color="#be11b2" /><stop offset="1.000" stop-color="#e811a4" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#0011f8", "#1511ea", "#3f11dc", "#6911ce", "#9311c0", "#be11b2", "#e811a4"]

// https://grabient.com/_gJZgBDgMggZBgAAgIWgBkgdZgBjgKpgAAgDG?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(0.601, 0.067, 0.800);
    vec3 b = vec3(1.601, 0.000, 0.534);
    vec3 c = vec3(0.100, 1.881, 0.099);
    vec3 d = vec3(0.681, 0.000, 0.198);
    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);
}

[
  [0.601, 0.067, 0.800],
  [1.601, 0.000, 0.534],
  [0.100, 1.881, 0.099],
  [0.681, 0.000, 0.198]
]

Gradient palette editor — #0011f8 to #e811a4