Cobalt blue to purple blue to bright purple gradient palette editor

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

background: linear-gradient(135deg, #1300a5 0.000%, #3c00c2 25.000%, #6700e0 50.000%, #9300fd 75.000%, #c000ff 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gKHgAAgMigRvgAAgMQgBjgBhgBfgKagAAgLO?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="#1300a5" /><stop offset="0.250" stop-color="#3c00c2" /><stop offset="0.500" stop-color="#6700e0" /><stop offset="0.750" stop-color="#9300fd" /><stop offset="1.000" stop-color="#c000ff" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#1300a5", "#3c00c2", "#6700e0", "#9300fd", "#c000ff"]

// https://grabient.com/_gKHgAAgMigRvgAAgMQgBjgBhgBfgKagAAgLO?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(0.647, 0.000, 0.802);
    vec3 b = vec3(1.135, 0.000, 0.784);
    vec3 c = vec3(0.099, 0.097, 0.095);
    vec3 d = vec3(0.666, 0.000, 0.718);
    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);
}

[
  [0.647, 0.000, 0.802],
  [1.135, 0.000, 0.784],
  [0.099, 0.097, 0.095],
  [0.666, 0.000, 0.718]
]