/* https://grabient.com/_gI7gG7gHngIAgFkgCSgHMgJwgO5gHFgIugGQ?style=linearGradient&steps=7&angle=270 */

background: linear-gradient(270deg, #151c5e 0.000%, #114159 16.667%, #2b7a75 33.333%, #5caf97 50.000%, #9acba1 66.667%, #d5c189 83.333%, #ff9766 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gI7gG7gHngIAgFkgCSgHMgJwgO5gHFgIugGQ?style=linearGradient&steps=7&angle=270 -->
            <defs>
              <linearGradient id="gradient" x1="1.000" y1="0.500" x2="0.000" y2="0.500">
        <stop offset="0.000" stop-color="#151c5e" /><stop offset="0.167" stop-color="#114159" /><stop offset="0.333" stop-color="#2b7a75" /><stop offset="0.500" stop-color="#5caf97" /><stop offset="0.667" stop-color="#9acba1" /><stop offset="0.833" stop-color="#d5c189" /><stop offset="1.000" stop-color="#ff9766" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#151c5e", "#114159", "#2b7a75", "#5caf97", "#9acba1", "#d5c189", "#ff9766"]

// https://grabient.com/_gI7gG7gHngIAgFkgCSgHMgJwgO5gHFgIugGQ?style=linearGradient&steps=7&angle=270
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 270.0;

vec3 palette(float t) {
    vec3 a = vec3(0.571, 0.443, 0.487);
    vec3 b = vec3(0.512, 0.356, 0.146);
    vec3 c = vec3(0.460, 0.624, 0.953);
    vec3 d = vec3(0.453, 0.558, 0.400);
    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);
}

[
  [0.571, 0.443, 0.487],
  [0.512, 0.356, 0.146],
  [0.460, 0.624, 0.953],
  [0.453, 0.558, 0.400]
]

Gradient palette editor — #151c5e to #ff9766