#B9472E

CSS

:root {
  --crimson-boy: #b9472e;
  --crimson-boy-rgb: 185 71 46;
  --crimson-boy-oklch: oklch(0.549 0.153 33.9);
}

.element {
  color: var(--crimson-boy);
  background-color: hsl(11 60% 45%);
  border-color: oklch(0.549 0.153 33.9);
}

Tailwind CSS v4

@theme {
  --color-crimson-boy: #b9472e;
  --color-crimson-boy-50: #ffe7d7;
  --color-crimson-boy-100: #ffd7c5;
  --color-crimson-boy-200: #ffbda7;
  --color-crimson-boy-300: #fb9a80;
  --color-crimson-boy-400: #ea7960;
  --color-crimson-boy-500: #d8573b;
  --color-crimson-boy-600: #b64b33;
  --color-crimson-boy-700: #933c28;
  --color-crimson-boy-800: #6e2a1e;
  --color-crimson-boy-900: #4d1c14;
  --color-crimson-boy-950: #330c06;
}

SCSS

$crimson-boy: #b9472e;
$crimson-boy-rgb: 185, 71, 46;
$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);
}