Gradient palette editor — #90864e to #5f5b68

/* https://grabient.com/_gHagLvgFFgBlgGXgBYgWngDHgTWgBDgFYgLM?style=linearGradient&steps=8&angle=315 */

background: linear-gradient(315deg, #90864e 0.000%, #757764 14.286%, #5f6b67 28.571%, #6f6253 42.857%, #8d5b3f 57.143%, #8e5841 71.429%, #705857 85.714%, #5f5b68 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gHagLvgFFgBlgGXgBYgWngDHgTWgBDgFYgLM?style=linearGradient&steps=8&angle=315 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.854" x2="0.146" y2="0.146">
        <stop offset="0.000" stop-color="#90864e" /><stop offset="0.143" stop-color="#757764" /><stop offset="0.286" stop-color="#5f6b67" /><stop offset="0.429" stop-color="#6f6253" /><stop offset="0.571" stop-color="#8d5b3f" /><stop offset="0.714" stop-color="#8e5841" /><stop offset="0.857" stop-color="#705857" /><stop offset="1.000" stop-color="#5f5b68" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#90864e", "#757764", "#5f6b67", "#6f6253", "#8d5b3f", "#8e5841", "#705857", "#5f5b68"]

// https://grabient.com/_gHagLvgFFgBlgGXgBYgWngDHgTWgBDgFYgLM?style=linearGradient&steps=8&angle=315
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 8.0;
const float ANGLE = 315.0;

vec3 palette(float t) {
    vec3 a = vec3(0.474, 0.751, 0.325);
    vec3 b = vec3(0.101, 0.407, 0.088);
    vec3 c = vec3(1.447, 0.199, 1.238);
    vec3 d = vec3(0.067, 0.344, 0.716);
    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);
}

[
  [0.474, 0.751, 0.325],
  [0.101, 0.407, 0.088],
  [1.447, 0.199, 1.238],
  [0.067, 0.344, 0.716]
]