#BC5853

CSS

:root {
  --autumn-fire: #bc5853;
  --autumn-fire-rgb: 188 88 83;
  --autumn-fire-oklch: oklch(0.583 0.13 24.8);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(3 44% 53%);
  border-color: oklch(0.583 0.13 24.8);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #bc5853;
  --color-autumn-fire-50: #ffe8e1;
  --color-autumn-fire-100: #ffd8d1;
  --color-autumn-fire-200: #ffbfb7;
  --color-autumn-fire-300: #f39d93;
  --color-autumn-fire-400: #e17e77;
  --color-autumn-fire-500: #ce5e59;
  --color-autumn-fire-600: #ae514c;
  --color-autumn-fire-700: #8c403c;
  --color-autumn-fire-800: #682e2d;
  --color-autumn-fire-900: #491f1e;
  --color-autumn-fire-950: #300e0e;
}

SCSS

$autumn-fire: #bc5853;
$autumn-fire-rgb: 188, 88, 83;
$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);
}