#CA474E

CSS

:root {
  --autumn-fire: #ca474e;
  --autumn-fire-rgb: 202 71 78;
  --autumn-fire-oklch: oklch(0.581 0.166 20.9);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(357 55% 54%);
  border-color: oklch(0.581 0.166 20.9);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #ca474e;
  --color-autumn-fire-50: #ffe3df;
  --color-autumn-fire-100: #ffd3ce;
  --color-autumn-fire-200: #ffb8b3;
  --color-autumn-fire-300: #ff938f;
  --color-autumn-fire-400: #f07173;
  --color-autumn-fire-500: #df4b54;
  --color-autumn-fire-600: #bc4148;
  --color-autumn-fire-700: #973439;
  --color-autumn-fire-800: #71242b;
  --color-autumn-fire-900: #50181d;
  --color-autumn-fire-950: #34080d;
}

SCSS

$autumn-fire: #ca474e;
$autumn-fire-rgb: 202, 71, 78;
$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);
}