/* https://grabient.com/_ghogJqgIugh8gHfgEBgBpgHkgIZgHHgGvgII?style=linearGradient&steps=6&angle=315 */

background: linear-gradient(315deg, #112f4d 0.000%, #012561 20.000%, #004788 40.000%, #0088b2 60.000%, #0bd0cd 80.000%, #22ffcc 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_ghogJqgIugh8gHfgEBgBpgHkgIZgHHgGvgII?style=linearGradient&steps=6&angle=315 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.854" x2="0.146" y2="0.146">
        <stop offset="0.000" stop-color="#112f4d" /><stop offset="0.200" stop-color="#012561" /><stop offset="0.400" stop-color="#004788" /><stop offset="0.600" stop-color="#0088b2" /><stop offset="0.800" stop-color="#0bd0cd" /><stop offset="1.000" stop-color="#22ffcc" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#112f4d", "#012561", "#004788", "#0088b2", "#0bd0cd", "#22ffcc"]

// https://grabient.com/_ghogJqgIugh8gHfgEBgBpgHkgIZgHHgGvgII?style=linearGradient&steps=6&angle=315
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 6.0;
const float ANGLE = 315.0;

vec3 palette(float t) {
    vec3 a = vec3(2.152, 0.618, 0.558);
    vec3 b = vec3(2.172, 0.479, 0.257);
    vec3 c = vec3(0.105, 0.484, 0.537);
    vec3 d = vec3(0.455, 0.431, 0.520);
    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);
}

[
  [2.152, 0.618, 0.558],
  [2.172, 0.479, 0.257],
  [0.105, 0.484, 0.537],
  [0.455, 0.431, 0.520]
]

Gradient palette editor — #112f4d to #22ffcc