/* https://grabient.com/_gKjgJOgKhgMGgJ2gF5gBmgBigB8gKhgKngKT?style=linearGradient&steps=5&angle=315 */

background: linear-gradient(315deg, #505178 0.000%, #6d6888 25.000%, #8c809a 50.000%, #ac99ad 75.000%, #cbb2bf 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gKjgJOgKhgMGgJ2gF5gBmgBigB8gKhgKngKT?style=linearGradient&steps=5&angle=315 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.854" x2="0.146" y2="0.146">
        <stop offset="0.000" stop-color="#505178" /><stop offset="0.250" stop-color="#6d6888" /><stop offset="0.500" stop-color="#8c809a" /><stop offset="0.750" stop-color="#ac99ad" /><stop offset="1.000" stop-color="#cbb2bf" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#505178", "#6d6888", "#8c809a", "#ac99ad", "#cbb2bf"]

// https://grabient.com/_gKjgJOgKhgMGgJ2gF5gBmgBigB8gKhgKngKT?style=linearGradient&steps=5&angle=315
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 5.0;
const float ANGLE = 315.0;

vec3 palette(float t) {
    vec3 a = vec3(0.675, 0.590, 0.673);
    vec3 b = vec3(0.774, 0.630, 0.377);
    vec3 c = vec3(0.102, 0.098, 0.124);
    vec3 d = vec3(0.673, 0.679, 0.659);
    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);
}

[
  [0.675, 0.590, 0.673],
  [0.774, 0.630, 0.377],
  [0.102, 0.098, 0.124],
  [0.673, 0.679, 0.659]
]

Gradient palette editor — #505178 to #cbb2bf