Gradient palette editor — #ff4b42 to #36fc75

/* https://grabient.com/_gL2gGwgMuf0JgQVf5Gf8Sf-HgE-f26f0Ff-McfvovogA?style=linearGradient&steps=7&angle=90 */

background: linear-gradient(90deg, #ff4b42 0.000%, #ff6c2e 16.667%, #ee8c26 33.333%, #c3ac2a 50.000%, #93c939 66.667%, #63e453 83.333%, #36fc75 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gL2gGwgMuf0JgQVf5Gf8Sf-HgE-f26f0Ff-McfvovogA?style=linearGradient&steps=7&angle=90 -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#ff4b42" /><stop offset="0.167" stop-color="#ff6c2e" /><stop offset="0.333" stop-color="#ee8c26" /><stop offset="0.500" stop-color="#c3ac2a" /><stop offset="0.667" stop-color="#93c939" /><stop offset="0.833" stop-color="#63e453" /><stop offset="1.000" stop-color="#36fc75" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#ff4b42", "#ff6c2e", "#ee8c26", "#c3ac2a", "#93c939", "#63e453", "#36fc75"]

// https://grabient.com/_gL2gGwgMuf0JgQVf5Gf8Sf-HgE-f26f0Ff-McfvovogA?style=linearGradient&steps=7&angle=90
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 7.0;
const float ANGLE = 90.0;

vec3 palette(float t) {
    vec3 a = vec3(0.533, 0.207, 0.589);
    vec3 b = vec3(-0.759, 1.045, -0.442);
    vec3 c = vec3(-0.238, -0.121, 0.318);
    vec3 d = vec3(-0.582, -0.763, -0.116);
    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);
}

[
  [0.533, 0.207, 0.589],
  [-0.759, 1.045, -0.442],
  [-0.238, -0.121, 0.318],
  [-0.582, -0.763, -0.116]
]