Earthy dark maroon to grayish brown to gainsboro gradient palette editor

/* https://grabient.com/_gKEf4mgHUgL9gX1gG3gCOgB7gG1gKIgMagH5?style=linearGradient&steps=6&angle=180 */

background: linear-gradient(180deg, #300007 0.000%, #4d2a1a 20.000%, #6e5e48 40.000%, #908d83 60.000%, #b2b6bc 80.000%, #d5d8e0 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gKEf4mgHUgL9gX1gG3gCOgB7gG1gKIgMagH5?style=linearGradient&steps=6&angle=180 -->
            <defs>
              <linearGradient id="gradient" x1="0.500" y1="0.000" x2="0.500" y2="1.000">
        <stop offset="0.000" stop-color="#300007" /><stop offset="0.200" stop-color="#4d2a1a" /><stop offset="0.400" stop-color="#6e5e48" /><stop offset="0.600" stop-color="#908d83" /><stop offset="0.800" stop-color="#b2b6bc" /><stop offset="1.000" stop-color="#d5d8e0" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#300007", "#4d2a1a", "#6e5e48", "#908d83", "#b2b6bc", "#d5d8e0"]

// https://grabient.com/_gKEf4mgHUgL9gX1gG3gCOgB7gG1gKIgMagH5?style=linearGradient&steps=6&angle=180
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 6.0;
const float ANGLE = 180.0;

vec3 palette(float t) {
    vec3 a = vec3(0.644, -0.474, 0.468);
    vec3 b = vec3(0.765, 1.525, 0.439);
    vec3 c = vec3(0.142, 0.123, 0.437);
    vec3 d = vec3(0.648, 0.794, 0.505);
    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);
}

[
  [0.644, -0.474, 0.468],
  [0.765, 1.525, 0.439],
  [0.142, 0.123, 0.437],
  [0.648, 0.794, 0.505]
]