#C8494F

CSS

:root {
  --autumn-fire: #c8494f;
  --autumn-fire-rgb: 200 73 79;
  --autumn-fire-oklch: oklch(0.58 0.162 21);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(357 54% 54%);
  border-color: oklch(0.58 0.162 21);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #c8494f;
  --color-autumn-fire-50: #ffe4e0;
  --color-autumn-fire-100: #ffd3cf;
  --color-autumn-fire-200: #ffb9b4;
  --color-autumn-fire-300: #ff9590;
  --color-autumn-fire-400: #ef7274;
  --color-autumn-fire-500: #dd4e56;
  --color-autumn-fire-600: #ba4349;
  --color-autumn-fire-700: #96363a;
  --color-autumn-fire-800: #70252b;
  --color-autumn-fire-900: #4f191d;
  --color-autumn-fire-950: #34090d;
}

SCSS

$autumn-fire: #c8494f;
$autumn-fire-rgb: 200, 73, 79;
$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);
}