/* https://grabient.com/_fKRgJ0iAahD-gO2h7UgBlgBkgBigOSgLTgHe?style=linearGradient&steps=5&angle=135 */

background: linear-gradient(135deg, #4a7766 0.000%, #989d53 25.000%, #cdc370 50.000%, #e6e8bc 75.000%, #e3ffff 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_fKRgJ0iAahD-gO2h7UgBlgBkgBigOSgLTgHe?style=linearGradient&steps=5&angle=135 -->
            <defs>
              <linearGradient id="gradient" x1="0.146" y1="0.146" x2="0.854" y2="0.854">
        <stop offset="0.000" stop-color="#4a7766" /><stop offset="0.250" stop-color="#989d53" /><stop offset="0.500" stop-color="#cdc370" /><stop offset="0.750" stop-color="#e6e8bc" /><stop offset="1.000" stop-color="#e3ffff" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#4a7766", "#989d53", "#cdc370", "#e6e8bc", "#e3ffff"]

// https://grabient.com/_fKRgJ0iAahD-gO2h7UgBlgBkgBigOSgLTgHe?style=linearGradient&steps=5&angle=135
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 5.0;
const float ANGLE = 135.0;

vec3 palette(float t) {
    vec3 a = vec3(-3.439, 0.628, 8.218);
    vec3 b = vec3(4.350, 0.950, 7.892);
    vec3 c = vec3(0.101, 0.100, 0.098);
    vec3 d = vec3(0.914, 0.723, 0.478);
    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);
}

[
  [-3.439, 0.628, 8.218],
  [4.350, 0.950, 7.892],
  [0.101, 0.100, 0.098],
  [0.914, 0.723, 0.478]
]

Gradient palette editor — #4a7766 to #e3ffff