Rainbow dark forest green to dark indigo to chocolate brown to pine gradient palette editor

/* https://grabient.com/_gDGg5LgB_gCig4ZgBogMNgBkgZIgGNgHUgHX */

background: linear-gradient(90deg, #121f06 0.000%, #0a111f 16.667%, #1c0d3b 33.333%, #3c131c 50.000%, #562207 66.667%, #5a3c2a 83.333%, #455f38 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gDGg5LgB_gCig4ZgBogMNgBkgZIgGNgHUgHX -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#121f06" /><stop offset="0.167" stop-color="#0a111f" /><stop offset="0.333" stop-color="#1c0d3b" /><stop offset="0.500" stop-color="#3c131c" /><stop offset="0.667" stop-color="#562207" /><stop offset="0.833" stop-color="#5a3c2a" /><stop offset="1.000" stop-color="#455f38" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#121f06", "#0a111f", "#1c0d3b", "#3c131c", "#562207", "#5a3c2a", "#455f38"]

// https://grabient.com/_gDGg5LgB_gCig4ZgBogMNgBkgZIgGNgHUgHX
// 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(0.198, 3.659, 0.127);
    vec3 b = vec3(0.162, 3.609, 0.104);
    vec3 c = vec3(0.781, 0.100, 1.608);
    vec3 d = vec3(0.397, 0.468, 0.471);
    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);
}

[
  [0.198, 3.659, 0.127],
  [0.162, 3.609, 0.104],
  [0.781, 0.100, 1.608],
  [0.397, 0.468, 0.471]
]