/* https://grabient.com/_gdDgXCgI3gd1gXPgGBgBpgCBgGNgIigIVgIz?style=linearGradient&steps=6&angle=135 */

background: linear-gradient(135deg, #070536 0.000%, #1e1653 20.000%, #3c317f 40.000%, #6154b0 60.000%, #8d7fd8 80.000%, #beb1f0 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gdDgXCgI3gd1gXPgGBgBpgCBgGNgIigIVgIz?style=linearGradient&steps=6&angle=135 -->
            <defs>
              <linearGradient id="gradient" x1="0.146" y1="0.146" x2="0.854" y2="0.854">
        <stop offset="0.000" stop-color="#070536" /><stop offset="0.200" stop-color="#1e1653" /><stop offset="0.400" stop-color="#3c317f" /><stop offset="0.600" stop-color="#6154b0" /><stop offset="0.800" stop-color="#8d7fd8" /><stop offset="1.000" stop-color="#beb1f0" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#070536", "#1e1653", "#3c317f", "#6154b0", "#8d7fd8", "#beb1f0"]

// https://grabient.com/_gdDgXCgI3gd1gXPgGBgBpgCBgGNgIigIVgIz?style=linearGradient&steps=6&angle=135
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 6.0;
const float ANGLE = 135.0;

vec3 palette(float t) {
    vec3 a = vec3(1.859, 1.474, 0.567);
    vec3 b = vec3(1.909, 1.487, 0.385);
    vec3 c = vec3(0.105, 0.129, 0.397);
    vec3 d = vec3(0.546, 0.533, 0.563);
    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);
}

[
  [1.859, 1.474, 0.567],
  [1.909, 1.487, 0.385],
  [0.105, 0.129, 0.397],
  [0.546, 0.533, 0.563]
]

Gradient palette editor — #070536 to #beb1f0