#B24D31

CSS

:root {
  --crimson-boy: #b24d31;
  --crimson-boy-rgb: 178 77 49;
  --crimson-boy-oklch: oklch(0.546 0.139 36.3);
}

.element {
  color: var(--crimson-boy);
  background-color: hsl(13 57% 45%);
  border-color: oklch(0.546 0.139 36.3);
}

Tailwind CSS v4

@theme {
  --color-crimson-boy: #b24d31;
  --color-crimson-boy-50: #ffe8d9;
  --color-crimson-boy-100: #ffd9c7;
  --color-crimson-boy-200: #ffc0a9;
  --color-crimson-boy-300: #f59e83;
  --color-crimson-boy-400: #e37e63;
  --color-crimson-boy-500: #d15f3f;
  --color-crimson-boy-600: #b05136;
  --color-crimson-boy-700: #8e402b;
  --color-crimson-boy-800: #6a2e20;
  --color-crimson-boy-900: #4b1f15;
  --color-crimson-boy-950: #310e06;
}

SCSS

$crimson-boy: #b24d31;
$crimson-boy-rgb: 178, 77, 49;
$crimson-boy-light: mix(#fff, $crimson-boy, 20%);
$crimson-boy-dark: mix(#000, $crimson-boy, 20%);

.element {
  color: $crimson-boy;
  box-shadow: 0 0 0 2px rgba($crimson-boy, 0.35);
}