#BD4331

CSS

:root {
  --crimson-boy: #bd4331;
  --crimson-boy-rgb: 189 67 49;
  --crimson-boy-oklch: oklch(0.55 0.16 31.1);
}

.element {
  color: var(--crimson-boy);
  background-color: hsl(8 59% 47%);
  border-color: oklch(0.55 0.16 31.1);
}

Tailwind CSS v4

@theme {
  --color-crimson-boy: #bd4331;
  --color-crimson-boy-50: #ffe5d8;
  --color-crimson-boy-100: #ffd5c6;
  --color-crimson-boy-200: #ffbba8;
  --color-crimson-boy-300: #fe9781;
  --color-crimson-boy-400: #ee7661;
  --color-crimson-boy-500: #dc523d;
  --color-crimson-boy-600: #ba4735;
  --color-crimson-boy-700: #95382a;
  --color-crimson-boy-800: #70271f;
  --color-crimson-boy-900: #4f1a15;
  --color-crimson-boy-950: #340a06;
}

SCSS

$crimson-boy: #bd4331;
$crimson-boy-rgb: 189, 67, 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);
}