#BD5753

CSS

:root {
  --autumn-fire: #bd5753;
  --autumn-fire-rgb: 189 87 83;
  --autumn-fire-oklch: oklch(0.583 0.133 24.3);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(2 45% 53%);
  border-color: oklch(0.583 0.133 24.3);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #bd5753;
  --color-autumn-fire-50: #ffe7e1;
  --color-autumn-fire-100: #ffd8d1;
  --color-autumn-fire-200: #ffbfb7;
  --color-autumn-fire-300: #f49d93;
  --color-autumn-fire-400: #e27d77;
  --color-autumn-fire-500: #cf5d59;
  --color-autumn-fire-600: #af504c;
  --color-autumn-fire-700: #8d3f3c;
  --color-autumn-fire-800: #692d2d;
  --color-autumn-fire-900: #4a1e1e;
  --color-autumn-fire-950: #300e0e;
}

SCSS

$autumn-fire: #bd5753;
$autumn-fire-rgb: 189, 87, 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);
}