/* https://grabient.com/_f9DgG8hHwgL3gCXhEBgCSgJqgBjgAegNbgHJ?style=linearGradient&steps=6&angle=90 */

background: linear-gradient(90deg, #8e8a65 0.000%, #849749 20.000%, #748f3d 40.000%, #5f7643 60.000%, #455a5a 80.000%, #274b81 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_f9DgG8hHwgL3gCXhEBgCSgJqgBjgAegNbgHJ?style=linearGradient&steps=6&angle=90 -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#8e8a65" /><stop offset="0.200" stop-color="#849749" /><stop offset="0.400" stop-color="#748f3d" /><stop offset="0.600" stop-color="#5f7643" /><stop offset="0.800" stop-color="#455a5a" /><stop offset="1.000" stop-color="#274b81" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#8e8a65", "#849749", "#748f3d", "#5f7643", "#455a5a", "#274b81"]

// https://grabient.com/_f9DgG8hHwgL3gCXhEBgCSgJqgBjgAegNbgHJ?style=linearGradient&steps=6&angle=90
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 6.0;
const float ANGLE = 90.0;

vec3 palette(float t) {
    vec3 a = vec3(-0.189, 0.444, 4.592);
    vec3 b = vec3(0.759, 0.151, 4.353);
    vec3 c = vec3(0.146, 0.618, 0.099);
    vec3 d = vec3(0.030, 0.859, 0.457);
    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);
}

[
  [-0.189, 0.444, 4.592],
  [0.759, 0.151, 4.353],
  [0.146, 0.618, 0.099],
  [0.030, 0.859, 0.457]
]

Gradient palette editor — #8e8a65 to #274b81