Gradient palette editor — #166383 to #c8ded6

/* https://grabient.com/_gHUgJRgNMgGMgE5gFegFkgG5gEsgnuhIdgHA?style=linearGradient&steps=8&angle=225 */

background: linear-gradient(225deg, #166383 0.000%, #237f7e 14.286%, #399e80 28.571%, #55bc88 42.857%, #74d496 57.143%, #94e3a8 71.429%, #b1e7be 85.714%, #c8ded6 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gHUgJRgNMgGMgE5gFegFkgG5gEsgnuhIdgHA?style=linearGradient&steps=8&angle=225 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.146" x2="0.146" y2="0.854">
        <stop offset="0.000" stop-color="#166383" /><stop offset="0.143" stop-color="#237f7e" /><stop offset="0.286" stop-color="#399e80" /><stop offset="0.429" stop-color="#55bc88" /><stop offset="0.571" stop-color="#74d496" /><stop offset="0.714" stop-color="#94e3a8" /><stop offset="0.857" stop-color="#b1e7be" /><stop offset="1.000" stop-color="#c8ded6" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#166383", "#237f7e", "#399e80", "#55bc88", "#74d496", "#94e3a8", "#b1e7be", "#c8ded6"]

// https://grabient.com/_gHUgJRgNMgGMgE5gFegFkgG5gEsgnuhIdgHA?style=linearGradient&steps=8&angle=225
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 8.0;
const float ANGLE = 225.0;

vec3 palette(float t) {
    vec3 a = vec3(0.468, 0.593, 0.844);
    vec3 b = vec3(0.396, 0.313, 0.350);
    vec3 c = vec3(0.356, 0.441, 0.300);
    vec3 d = vec3(2.542, 4.637, 0.448);
    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);
}

[
  [0.468, 0.593, 0.844],
  [0.396, 0.313, 0.350],
  [0.356, 0.441, 0.300],
  [2.542, 4.637, 0.448]
]