Rainbow merlot to evergreen to dark blue to claret gradient palette editor

/* https://grabient.com/_gEIgCagFPgEHgCYgDUgPvgfcgrTgCBgIFgKx?style=linearGradient&steps=11&angle=225 */

background: linear-gradient(225deg, #720141 0.000%, #4c208a 10.000%, #234958 20.000%, #064320 30.000%, #021665 40.000%, #160186 50.000%, #3c2135 60.000%, #654a30 70.000%, #814282 80.000%, #85156c 90.000%, #6f0121 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gEIgCagFPgEHgCYgDUgPvgfcgrTgCBgIFgKx?style=linearGradient&steps=11&angle=225 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.146" x2="0.146" y2="0.854">
        <stop offset="0.000" stop-color="#720141" /><stop offset="0.100" stop-color="#4c208a" /><stop offset="0.200" stop-color="#234958" /><stop offset="0.300" stop-color="#064320" /><stop offset="0.400" stop-color="#021665" /><stop offset="0.500" stop-color="#160186" /><stop offset="0.600" stop-color="#3c2135" /><stop offset="0.700" stop-color="#654a30" /><stop offset="0.800" stop-color="#814282" /><stop offset="0.900" stop-color="#85156c" /><stop offset="1.000" stop-color="#6f0121" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#720141", "#4c208a", "#234958", "#064320", "#021665", "#160186", "#3c2135", "#654a30", "#814282", "#85156c", "#6f0121"]

// https://grabient.com/_gEIgCagFPgEHgCYgDUgPvgfcgrTgCBgIFgKx?style=linearGradient&steps=11&angle=225
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 11.0;
const float ANGLE = 225.0;

vec3 palette(float t) {
    vec3 a = vec3(0.264, 0.154, 0.335);
    vec3 b = vec3(0.263, 0.152, 0.212);
    vec3 c = vec3(1.007, 2.012, 2.771);
    vec3 d = vec3(0.129, 0.517, 0.689);
    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);
}

[
  [0.264, 0.154, 0.335],
  [0.263, 0.152, 0.212],
  [1.007, 2.012, 2.771],
  [0.129, 0.517, 0.689]
]