#C24F4D

CSS

:root {
  --autumn-fire: #c24f4d;
  --autumn-fire-rgb: 194 79 77;
  --autumn-fire-oklch: oklch(0.578 0.148 23.9);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(1 49% 53%);
  border-color: oklch(0.578 0.148 23.9);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #c24f4d;
  --color-autumn-fire-50: #ffe6df;
  --color-autumn-fire-100: #ffd6ce;
  --color-autumn-fire-200: #ffbcb3;
  --color-autumn-fire-300: #fa998f;
  --color-autumn-fire-400: #e97873;
  --color-autumn-fire-500: #d75654;
  --color-autumn-fire-600: #b54948;
  --color-autumn-fire-700: #923b39;
  --color-autumn-fire-800: #6d292a;
  --color-autumn-fire-900: #4d1c1c;
  --color-autumn-fire-950: #320b0d;
}

SCSS

$autumn-fire: #c24f4d;
$autumn-fire-rgb: 194, 79, 77;
$autumn-fire-light: mix(#fff, $autumn-fire, 20%);
$autumn-fire-dark: mix(#000, $autumn-fire, 20%);

.element {
  color: $autumn-fire;
  box-shadow: 0 0 0 2px rgba($autumn-fire, 0.35);
}