Gradient palette editor — #646146 to #a0a3ab

/* https://grabient.com/_gLIf6SgJhgGsgP0gFbgBogBigFCgJngNygHI */

background: linear-gradient(90deg, #646146 0.000%, #6c7243 16.667%, #75814a 33.333%, #7f8d5a 50.000%, #8a9771 66.667%, #959e8d 83.333%, #a0a3ab 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gLIf6SgJhgGsgP0gFbgBogBigFCgJngNygHI -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#646146" /><stop offset="0.167" stop-color="#6c7243" /><stop offset="0.333" stop-color="#75814a" /><stop offset="0.500" stop-color="#7f8d5a" /><stop offset="0.667" stop-color="#8a9771" /><stop offset="0.833" stop-color="#959e8d" /><stop offset="1.000" stop-color="#a0a3ab" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#646146", "#6c7243", "#75814a", "#7f8d5a", "#8a9771", "#959e8d", "#a0a3ab"]

// https://grabient.com/_gLIf6SgJhgGsgP0gFbgBogBigFCgJngNygHI
// 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(0.712, -0.366, 0.609);
    vec3 b = vec3(0.428, 1.012, 0.347);
    vec3 c = vec3(0.104, 0.098, 0.322);
    vec3 d = vec3(0.615, 0.882, 0.456);
    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);
}

[
  [0.712, -0.366, 0.609],
  [0.428, 1.012, 0.347],
  [0.104, 0.098, 0.322],
  [0.615, 0.882, 0.456]
]