/* https://grabient.com/_gFDfpFgHVgFQgfCgBogHlgBlgUSgHdgNkgHT?style=linearGradient&steps=7&angle=135 */

background: linear-gradient(135deg, #00005e 0.000%, #02056d 16.667%, #1b278d 33.333%, #42438b 50.000%, #6d5b6a 66.667%, #916e5e 83.333%, #a67b7a 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gFDfpFgHVgFQgfCgBogHlgBlgUSgHdgNkgHT?style=linearGradient&steps=7&angle=135 -->
            <defs>
              <linearGradient id="gradient" x1="0.146" y1="0.146" x2="0.854" y2="0.854">
        <stop offset="0.000" stop-color="#00005e" /><stop offset="0.167" stop-color="#02056d" /><stop offset="0.333" stop-color="#1b278d" /><stop offset="0.500" stop-color="#42438b" /><stop offset="0.667" stop-color="#6d5b6a" /><stop offset="0.833" stop-color="#916e5e" /><stop offset="1.000" stop-color="#a67b7a" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#00005e", "#02056d", "#1b278d", "#42438b", "#6d5b6a", "#916e5e", "#a67b7a"]

// https://grabient.com/_gFDfpFgHVgFQgfCgBogHlgBlgUSgHdgNkgHT?style=linearGradient&steps=7&angle=135
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 135.0;

vec3 palette(float t) {
    vec3 a = vec3(0.323, -1.467, 0.469);
    vec3 b = vec3(0.336, 1.986, 0.104);
    vec3 c = vec3(0.485, 0.101, 1.298);
    vec3 d = vec3(0.477, 0.868, 0.467);
    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);
}

[
  [0.323, -1.467, 0.469],
  [0.336, 1.986, 0.104],
  [0.485, 0.101, 1.298],
  [0.477, 0.868, 0.467]
]

Gradient palette editor — #00005e to #a67b7a