Gradient palette editor — #4c3870 to #ffbc65

/* https://grabient.com/_gKNgo3gG0gFtglhgBngH8gBigOfgIWgH9gL2 */

background: linear-gradient(90deg, #4c3870 0.000%, #623e86 16.667%, #8c4b87 33.333%, #bd5f74 50.000%, #e7785c 66.667%, #ff9755 83.333%, #ffbc65 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gKNgo3gG0gFtglhgBngH8gBigOfgIWgH9gL2 -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#4c3870" /><stop offset="0.167" stop-color="#623e86" /><stop offset="0.333" stop-color="#8c4b87" /><stop offset="0.500" stop-color="#bd5f74" /><stop offset="0.667" stop-color="#e7785c" /><stop offset="0.833" stop-color="#ff9755" /><stop offset="1.000" stop-color="#ffbc65" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#4c3870", "#623e86", "#8c4b87", "#bd5f74", "#e7785c", "#ff9755", "#ffbc65"]

// https://grabient.com/_gKNgo3gG0gFtglhgBngH8gBigOfgIWgH9gL2
// 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(0.653, 2.615, 0.436);
    vec3 b = vec3(0.365, 2.401, 0.103);
    vec3 c = vec3(0.508, 0.098, 0.927);
    vec3 d = vec3(0.534, 0.509, 0.758);
    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);
}

[
  [0.653, 2.615, 0.436],
  [0.365, 2.401, 0.103],
  [0.508, 0.098, 0.927],
  [0.534, 0.509, 0.758]
]