/* https://grabient.com/_fmEfXPgIFgiugxDgArgBhgBngHvgO3gOygAs?style=linearGradient&steps=6&angle=135 */

background: linear-gradient(135deg, #755a8e 0.000%, #86768b 20.000%, #8e8584 40.000%, #8e867e 60.000%, #867a7a 80.000%, #766279 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_fmEfXPgIFgiugxDgArgBhgBngHvgO3gOygAs?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="#755a8e" /><stop offset="0.200" stop-color="#86768b" /><stop offset="0.400" stop-color="#8e8584" /><stop offset="0.600" stop-color="#8e867e" /><stop offset="0.800" stop-color="#867a7a" /><stop offset="1.000" stop-color="#766279" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#755a8e", "#86768b", "#8e8584", "#8e867e", "#867a7a", "#766279"]

// https://grabient.com/_fmEfXPgIFgiugxDgArgBhgBngHvgO3gOygAs?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(-1.660, -2.609, 0.517);
    vec3 b = vec3(2.222, 3.139, 0.043);
    vec3 c = vec3(0.097, 0.103, 0.495);
    vec3 d = vec3(0.951, 0.946, 0.044);
    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);
}

[
  [-1.660, -2.609, 0.517],
  [2.222, 3.139, 0.043],
  [0.097, 0.103, 0.495],
  [0.951, 0.946, 0.044]
]

Gradient palette editor — #755a8e to #766279