#C1544E

CSS

:root {
  --autumn-fire: #c1544e;
  --autumn-fire-rgb: 193 84 78;
  --autumn-fire-oklch: oklch(0.584 0.142 25.6);
}

.element {
  color: var(--autumn-fire);
  background-color: hsl(3 48% 53%);
  border-color: oklch(0.584 0.142 25.6);
}

Tailwind CSS v4

@theme {
  --color-autumn-fire: #c1544e;
  --color-autumn-fire-50: #ffe7df;
  --color-autumn-fire-100: #ffd7ce;
  --color-autumn-fire-200: #ffbdb3;
  --color-autumn-fire-300: #f79b8f;
  --color-autumn-fire-400: #e67a72;
  --color-autumn-fire-500: #d45a53;
  --color-autumn-fire-600: #b34d47;
  --color-autumn-fire-700: #903d38;
  --color-autumn-fire-800: #6b2b2a;
  --color-autumn-fire-900: #4b1d1c;
  --color-autumn-fire-950: #310c0c;
}

SCSS

$autumn-fire: #c1544e;
$autumn-fire-rgb: 193, 84, 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);
}