/* https://grabient.com/_gJDfr-gNlgG1ggHgCYgGPgBmgHhgQUgOMgJ0?style=linearGradient&steps=6&angle=270 */

background: linear-gradient(270deg, #ff70c3 0.000%, #e391d7 20.000%, #b4aaee 40.000%, #7cbbff 60.000%, #4bc4ff 80.000%, #2bc4fc 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gJDfr-gNlgG1ggHgCYgGPgBmgHhgQUgOMgJ0?style=linearGradient&steps=6&angle=270 -->
            <defs>
              <linearGradient id="gradient" x1="1.000" y1="0.500" x2="0.000" y2="0.500">
        <stop offset="0.000" stop-color="#ff70c3" /><stop offset="0.200" stop-color="#e391d7" /><stop offset="0.400" stop-color="#b4aaee" /><stop offset="0.600" stop-color="#7cbbff" /><stop offset="0.800" stop-color="#4bc4ff" /><stop offset="1.000" stop-color="#2bc4fc" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#ff70c3", "#e391d7", "#b4aaee", "#7cbbff", "#4bc4ff", "#2bc4fc"]

// https://grabient.com/_gJDfr-gNlgG1ggHgCYgGPgBmgHhgQUgOMgJ0?style=linearGradient&steps=6&angle=270
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 6.0;
const float ANGLE = 270.0;

vec3 palette(float t) {
    vec3 a = vec3(0.579, -1.282, 0.869);
    vec3 b = vec3(0.437, 2.055, 0.152);
    vec3 c = vec3(0.399, 0.102, 0.481);
    vec3 d = vec3(1.044, 0.908, 0.628);
    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);
}

[
  [0.579, -1.282, 0.869],
  [0.437, 2.055, 0.152],
  [0.399, 0.102, 0.481],
  [1.044, 0.908, 0.628]
]

Gradient palette editor — #ff70c3 to #2bc4fc