Dark slate gray to gray green gradient palette editor

/* https://grabient.com/_gEhgHZgFygBngCGgB2gLWgO1gOvgK1gIagKU?style=linearGradient&steps=7&angle=225 */

background: linear-gradient(225deg, #40574e 0.000%, #546d6b 16.667%, #628d7c 33.333%, #629b73 50.000%, #558957 66.667%, #426842 83.333%, #335746 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gEhgHZgFygBngCGgB2gLWgO1gOvgK1gIagKU?style=linearGradient&steps=7&angle=225 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.146" x2="0.146" y2="0.854">
        <stop offset="0.000" stop-color="#40574e" /><stop offset="0.167" stop-color="#546d6b" /><stop offset="0.333" stop-color="#628d7c" /><stop offset="0.500" stop-color="#629b73" /><stop offset="0.667" stop-color="#558957" /><stop offset="0.833" stop-color="#426842" /><stop offset="1.000" stop-color="#335746" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#40574e", "#546d6b", "#628d7c", "#629b73", "#558957", "#426842", "#335746"]

// https://grabient.com/_gEhgHZgFygBngCGgB2gLWgO1gOvgK1gIagKU?style=linearGradient&steps=7&angle=225
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 225.0;

vec3 palette(float t) {
    vec3 a = vec3(0.289, 0.473, 0.370);
    vec3 b = vec3(0.103, 0.134, 0.118);
    vec3 c = vec3(0.726, 0.949, 0.943);
    vec3 d = vec3(0.693, 0.538, 0.660);
    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);
}

[
  [0.289, 0.473, 0.370],
  [0.103, 0.134, 0.118],
  [0.726, 0.949, 0.943],
  [0.693, 0.538, 0.660]
]