/* https://grabient.com/_gKHfgegFvgF1gqxgGGgT3gBngQzgJ5gNqgBP */

background: linear-gradient(90deg, #6500b5 0.000%, #da1a58 16.667%, #fe4702 33.333%, #9a6c14 50.000%, #478b7a 66.667%, #83a1c0 83.333%, #f3b096 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gKHfgegFvgF1gqxgGGgT3gBngQzgJ5gNqgBP -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#6500b5" /><stop offset="0.167" stop-color="#da1a58" /><stop offset="0.333" stop-color="#fe4702" /><stop offset="0.500" stop-color="#9a6c14" /><stop offset="0.667" stop-color="#478b7a" /><stop offset="0.833" stop-color="#83a1c0" /><stop offset="1.000" stop-color="#f3b096" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#6500b5", "#da1a58", "#fe4702", "#9a6c14", "#478b7a", "#83a1c0", "#f3b096"]

// https://grabient.com/_gKHfgegFvgF1gqxgGGgT3gBngQzgJ5gNqgBP
// 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(0.647, -2.018, 0.367);
    vec3 b = vec3(0.373, 2.737, 0.390);
    vec3 c = vec3(1.271, 0.103, 1.075);
    vec3 d = vec3(0.633, 0.874, 0.079);
    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);
}

[
  [0.647, -2.018, 0.367],
  [0.373, 2.737, 0.390],
  [1.271, 0.103, 1.075],
  [0.633, 0.874, 0.079]
]

Gradient palette editor — #6500b5 to #f3b096