#BA5550

CSS

:root {
  --autumn-fire: #ba5550;
  --autumn-fire-rgb: 186 85 80;
  --autumn-fire-oklch: oklch(0.575 0.132 24.9);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(3 43% 52%);
  border-color: oklch(0.575 0.132 24.9);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #ba5550;
  --color-autumn-fire-50: #ffe8e1;
  --color-autumn-fire-100: #ffd8d0;
  --color-autumn-fire-200: #ffbfb6;
  --color-autumn-fire-300: #f49d93;
  --color-autumn-fire-400: #e27d76;
  --color-autumn-fire-500: #cf5e58;
  --color-autumn-fire-600: #af504b;
  --color-autumn-fire-700: #8d403c;
  --color-autumn-fire-800: #692d2c;
  --color-autumn-fire-900: #4a1f1e;
  --color-autumn-fire-950: #300e0e;
}

SCSS

$autumn-fire: #ba5550;
$autumn-fire-rgb: 186, 85, 80;
$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);
}