/* https://grabient.com/_gU0gG7gDhgVigJDgMYgF4gJTgHCgFkgIxgOP?style=linearGradient&steps=7&angle=315 */

background: linear-gradient(315deg, #7b00e5 0.000%, #2122ff 16.667%, #007af5 33.333%, #02cebe 50.000%, #40ff6a 66.667%, #a9fb0c 83.333%, #ffc300 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gU0gG7gDhgVigJDgMYgF4gJTgHCgFkgIxgOP?style=linearGradient&steps=7&angle=315 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.854" x2="0.146" y2="0.146">
        <stop offset="0.000" stop-color="#7b00e5" /><stop offset="0.167" stop-color="#2122ff" /><stop offset="0.333" stop-color="#007af5" /><stop offset="0.500" stop-color="#02cebe" /><stop offset="0.667" stop-color="#40ff6a" /><stop offset="0.833" stop-color="#a9fb0c" /><stop offset="1.000" stop-color="#ffc300" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#7b00e5", "#2122ff", "#007af5", "#02cebe", "#40ff6a", "#a9fb0c", "#ffc300"]

// https://grabient.com/_gU0gG7gDhgVigJDgMYgF4gJTgHCgFkgIxgOP?style=linearGradient&steps=7&angle=315
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 315.0;

vec3 palette(float t) {
    vec3 a = vec3(1.332, 0.443, 0.225);
    vec3 b = vec3(1.378, 0.579, 0.792);
    vec3 c = vec3(0.376, 0.595, 0.450);
    vec3 d = vec3(0.356, 0.561, 0.911);
    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);
}

[
  [1.332, 0.443, 0.225],
  [1.378, 0.579, 0.792],
  [0.376, 0.595, 0.450],
  [0.356, 0.561, 0.911]
]

Gradient palette editor — #7b00e5 to #ffc300