#BE551B

CSS

:root {
  --titian-red: #be551b;
  --titian-red-rgb: 190 85 27;
  --titian-red-oklch: oklch(0.574 0.151 45);
}

.element {
  color: var(--titian-red);
  background-color: hsl(21 75% 43%);
  border-color: oklch(0.574 0.151 45);
}

Tailwind CSS v4

@theme {
  --color-titian-red: #be551b;
  --color-titian-red-50: #ffe9d1;
  --color-titian-red-100: #ffd9bd;
  --color-titian-red-200: #ffc19d;
  --color-titian-red-300: #f69f73;
  --color-titian-red-400: #e67e4d;
  --color-titian-red-500: #d45e1b;
  --color-titian-red-600: #b3501a;
  --color-titian-red-700: #904015;
  --color-titian-red-800: #6c2d10;
  --color-titian-red-900: #4c1f0a;
  --color-titian-red-950: #320e00;
}

SCSS

$titian-red: #be551b;
$titian-red-rgb: 190, 85, 27;
$titian-red-light: mix(#fff, $titian-red, 20%);
$titian-red-dark: mix(#000, $titian-red, 20%);

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