#B44B37

CSS

:root {
  --crimson-boy: #b44b37;
  --crimson-boy-rgb: 180 75 55;
  --crimson-boy-oklch: oklch(0.547 0.141 32.6);
}

.element {
  color: var(--crimson-boy);
  background-color: hsl(10 53% 46%);
  border-color: oklch(0.547 0.141 32.6);
}

Tailwind CSS v4

@theme {
  --color-crimson-boy: #b44b37;
  --color-crimson-boy-50: #ffe8db;
  --color-crimson-boy-100: #ffd8c9;
  --color-crimson-boy-200: #ffbfac;
  --color-crimson-boy-300: #f69c86;
  --color-crimson-boy-400: #e57c67;
  --color-crimson-boy-500: #d35c45;
  --color-crimson-boy-600: #b24f3b;
  --color-crimson-boy-700: #8f3f2f;
  --color-crimson-boy-800: #6b2c23;
  --color-crimson-boy-900: #4b1e17;
  --color-crimson-boy-950: #310d08;
}

SCSS

$crimson-boy: #b44b37;
$crimson-boy-rgb: 180, 75, 55;
$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);
}