#C45519

CSS

:root {
  --titian-red: #c45519;
  --titian-red-rgb: 196 85 25;
  --titian-red-oklch: oklch(0.583 0.157 44.2);
}

.element {
  color: var(--titian-red);
  background-color: hsl(21 77% 43%);
  border-color: oklch(0.583 0.157 44.2);
}

Tailwind CSS v4

@theme {
  --color-titian-red: #c45519;
  --color-titian-red-50: #ffe8d0;
  --color-titian-red-100: #ffd8bc;
  --color-titian-red-200: #ffc09b;
  --color-titian-red-300: #f99d70;
  --color-titian-red-400: #e97c4a;
  --color-titian-red-500: #d75b12;
  --color-titian-red-600: #b64e15;
  --color-titian-red-700: #923e11;
  --color-titian-red-800: #6d2b0d;
  --color-titian-red-900: #4d1d08;
  --color-titian-red-950: #330c00;
}

SCSS

$titian-red: #c45519;
$titian-red-rgb: 196, 85, 25;
$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);
}