/* https://grabient.com/_gtvgFDgGhgtdgD0gFtgBfgHsgFagIZgIRgJV?style=linearGradient&steps=6&angle=135 */

background: linear-gradient(135deg, #19151e 0.000%, #32273c 20.000%, #554962 40.000%, #826e8a 60.000%, #b889ac 80.000%, #f590c2 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gtvgFDgGhgtdgD0gFtgBfgHsgFagIZgIRgJV?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="#19151e" /><stop offset="0.200" stop-color="#32273c" /><stop offset="0.400" stop-color="#554962" /><stop offset="0.600" stop-color="#826e8a" /><stop offset="0.800" stop-color="#b889ac" /><stop offset="1.000" stop-color="#f590c2" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#19151e", "#32273c", "#554962", "#826e8a", "#b889ac", "#f590c2"]

// https://grabient.com/_gtvgFDgGhgtdgD0gFtgBfgHsgFagIZgIRgJV?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(2.927, 0.323, 0.417);
    vec3 b = vec3(2.909, 0.244, 0.365);
    vec3 c = vec3(0.095, 0.492, 0.346);
    vec3 d = vec3(0.537, 0.529, 0.597);
    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);
}

[
  [2.927, 0.323, 0.417],
  [2.909, 0.244, 0.365],
  [0.095, 0.492, 0.346],
  [0.537, 0.529, 0.597]
]

Gradient palette editor — #19151e to #f590c2