/* https://grabient.com/_gNgga7gQ6gOsgaigQ0gDFgBkgBggJAgH1gHv?style=linearGradient&steps=5&angle=315 */

background: linear-gradient(315deg, #070602 0.000%, #330c03 25.000%, #6f1c0b 50.000%, #b53719 75.000%, #ff5b2d 100.000%);

<svg xmlns="http://www.w3.org/2000/svg" width="800" height="400" viewBox="0 0 800 400" preserveAspectRatio="none">
            <!-- https://grabient.com/_gNgga7gQ6gOsgaigQ0gDFgBkgBggJAgH1gHv?style=linearGradient&steps=5&angle=315 -->
            <defs>
              <linearGradient id="gradient" x1="0.854" y1="0.854" x2="0.146" y2="0.146">
        <stop offset="0.000" stop-color="#070602" /><stop offset="0.250" stop-color="#330c03" /><stop offset="0.500" stop-color="#6f1c0b" /><stop offset="0.750" stop-color="#b53719" /><stop offset="1.000" stop-color="#ff5b2d" />
              </linearGradient>
            </defs>
            <rect x="0" y="0" width="800" height="400" fill="url(#gradient)" />
          </svg>

["#070602", "#330c03", "#6f1c0b", "#b53719", "#ff5b2d"]

// https://grabient.com/_gNgga7gQ6gOsgaigQ0gDFgBkgBggJAgH1gHv?style=linearGradient&steps=5&angle=315
// cosine gradient palette — https://iquilezles.org/articles/palettes/
const float STEPS = 5.0;
const float ANGLE = 315.0;

vec3 palette(float t) {
    vec3 a = vec3(0.864, 1.723, 1.082);
    vec3 b = vec3(0.940, 1.698, 1.076);
    vec3 c = vec3(0.197, 0.100, 0.096);
    vec3 d = vec3(0.576, 0.501, 0.495);
    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);
}

[
  [0.864, 1.723, 1.082],
  [0.940, 1.698, 1.076],
  [0.197, 0.100, 0.096],
  [0.576, 0.501, 0.495]
]

Gradient palette editor — #070602 to #ff5b2d