Charcoal gray to blue green to dull red gradient palette editor

/* https://grabient.com/_gHsgE0gEHgGEgC6gBQgLzgJngMHgGHgKwgMU */

background: linear-gradient(90deg, #313d48 0.000%, #1b5a55 16.667%, #407457 33.333%, #897e4c 50.000%, #cb753c 66.667%, #e05d30 83.333%, #ba3f30 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gHsgE0gEHgGEgC6gBQgLzgJngMHgGHgKwgMU -->
            <defs>
              <linearGradient id="gradient" x1="0.000" y1="0.500" x2="1.000" y2="0.500">
        <stop offset="0.000" stop-color="#313d48" /><stop offset="0.167" stop-color="#1b5a55" /><stop offset="0.333" stop-color="#407457" /><stop offset="0.500" stop-color="#897e4c" /><stop offset="0.667" stop-color="#cb753c" /><stop offset="0.833" stop-color="#e05d30" /><stop offset="1.000" stop-color="#ba3f30" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#313d48", "#1b5a55", "#407457", "#897e4c", "#cb753c", "#e05d30", "#ba3f30"]

// https://grabient.com/_gHsgE0gEHgGEgC6gBQgLzgJngMHgGHgKwgMU
// 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(0.492, 0.308, 0.263);
    vec3 b = vec3(0.388, 0.186, 0.080);
    vec3 c = vec3(0.755, 0.615, 0.775);
    vec3 d = vec3(0.391, 0.688, 0.788);
    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);
}

[
  [0.492, 0.308, 0.263],
  [0.388, 0.186, 0.080],
  [0.755, 0.615, 0.775],
  [0.391, 0.688, 0.788]
]