#BA5555

CSS

:root {
  --autumn-fire: #ba5555;
  --autumn-fire-rgb: 186 85 85;
  --autumn-fire-oklch: oklch(0.576 0.131 22);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(0 42% 53%);
  border-color: oklch(0.576 0.131 22);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #ba5555;
  --color-autumn-fire-50: #ffe7e3;
  --color-autumn-fire-100: #ffd8d3;
  --color-autumn-fire-200: #ffbfb9;
  --color-autumn-fire-300: #f39d97;
  --color-autumn-fire-400: #e17d7b;
  --color-autumn-fire-500: #cf5d5e;
  --color-autumn-fire-600: #af5050;
  --color-autumn-fire-700: #8c403f;
  --color-autumn-fire-800: #682d2f;
  --color-autumn-fire-900: #491f20;
  --color-autumn-fire-950: #300e0f;
}

SCSS

$autumn-fire: #ba5555;
$autumn-fire-rgb: 186, 85, 85;
$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);
}