/* https://grabient.com/_gHpgO2gG_gJOgRYgD8gJbgBggQagIGgJggIX?style=linearGradient&steps=7&angle=270 */

background: linear-gradient(270deg, #001633 0.000%, #0e2862 16.667%, #603ea2 33.333%, #bc54ae 50.000%, #ff6d78 66.667%, #ff873c 83.333%, #eaa13b 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gHpgO2gG_gJOgRYgD8gJbgBggQagIGgJggIX?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="#001633" /><stop offset="0.167" stop-color="#0e2862" /><stop offset="0.333" stop-color="#603ea2" /><stop offset="0.500" stop-color="#bc54ae" /><stop offset="0.667" stop-color="#ff6d78" /><stop offset="0.833" stop-color="#ff873c" /><stop offset="1.000" stop-color="#eaa13b" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#001633", "#0e2862", "#603ea2", "#bc54ae", "#ff6d78", "#ff873c", "#eaa13b"]

// https://grabient.com/_gHpgO2gG_gJOgRYgD8gJbgBggQagIGgJggIX?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(0.489, 0.950, 0.447);
    vec3 b = vec3(0.590, 1.112, 0.252);
    vec3 c = vec3(0.603, 0.096, 1.050);
    vec3 d = vec3(0.518, 0.608, 0.535);
    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);
}

[
  [0.489, 0.950, 0.447],
  [0.590, 1.112, 0.252],
  [0.603, 0.096, 1.050],
  [0.518, 0.608, 0.535]
]

Gradient palette editor — #001633 to #eaa13b