Gradient palette editor — #b4301b to #7541cb

/* https://grabient.com/_gJUgGQgHDgDXgElgFcgMhgLIgHsgNFgJtgIK?style=linearGradient&steps=7&angle=135 */

background: linear-gradient(135deg, #b4301b 0.000%, #ce612d 16.667%, #c49550 33.333%, #9cb07d 50.000%, #72a4a7 66.667%, #6177c4 83.333%, #7541cb 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gJUgGQgHDgDXgElgFcgMhgLIgHsgNFgJtgIK?style=linearGradient&steps=7&angle=135 -->
            <defs>
              <linearGradient id="gradient" x1="0.146" y1="0.146" x2="0.854" y2="0.854">
        <stop offset="0.000" stop-color="#b4301b" /><stop offset="0.167" stop-color="#ce612d" /><stop offset="0.333" stop-color="#c49550" /><stop offset="0.500" stop-color="#9cb07d" /><stop offset="0.667" stop-color="#72a4a7" /><stop offset="0.833" stop-color="#6177c4" /><stop offset="1.000" stop-color="#7541cb" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#b4301b", "#ce612d", "#c49550", "#9cb07d", "#72a4a7", "#6177c4", "#7541cb"]

// https://grabient.com/_gJUgGQgHDgDXgElgFcgMhgLIgHsgNFgJtgIK?style=linearGradient&steps=7&angle=135
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 135.0;

vec3 palette(float t) {
    vec3 a = vec3(0.596, 0.400, 0.451);
    vec3 b = vec3(0.215, 0.293, 0.348);
    vec3 c = vec3(0.801, 0.712, 0.492);
    vec3 d = vec3(0.837, 0.621, 0.522);
    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);
}

[
  [0.596, 0.400, 0.451],
  [0.215, 0.293, 0.348],
  [0.801, 0.712, 0.492],
  [0.837, 0.621, 0.522]
]