#BC5252

CSS

:root {
  --autumn-fire: #bc5252;
  --autumn-fire-rgb: 188 82 82;
  --autumn-fire-oklch: oklch(0.574 0.137 22.4);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(0 44% 53%);
  border-color: oklch(0.574 0.137 22.4);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #bc5252;
  --color-autumn-fire-50: #ffe7e2;
  --color-autumn-fire-100: #ffd7d1;
  --color-autumn-fire-200: #ffbeb7;
  --color-autumn-fire-300: #f69b94;
  --color-autumn-fire-400: #e47b79;
  --color-autumn-fire-500: #d25b5b;
  --color-autumn-fire-600: #b14d4d;
  --color-autumn-fire-700: #8e3e3e;
  --color-autumn-fire-800: #6a2c2e;
  --color-autumn-fire-900: #4b1e1f;
  --color-autumn-fire-950: #310d0f;
}

SCSS

$autumn-fire: #bc5252;
$autumn-fire-rgb: 188, 82, 82;
$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);
}