#C25621

CSS

:root {
  --titian-red: #c25621;
  --titian-red-rgb: 194 86 33;
  --titian-red-oklch: oklch(0.582 0.152 43.4);
}

.element {
  color: var(--titian-red);
  background-color: hsl(20 71% 45%);
  border-color: oklch(0.582 0.152 43.4);
}

Tailwind CSS v4

@theme {
  --color-titian-red: #c25621;
  --color-titian-red-50: #ffe8d1;
  --color-titian-red-100: #ffd9be;
  --color-titian-red-200: #ffc09e;
  --color-titian-red-300: #f89e74;
  --color-titian-red-400: #e77d4f;
  --color-titian-red-500: #d55c1e;
  --color-titian-red-600: #b44f1d;
  --color-titian-red-700: #913f17;
  --color-titian-red-800: #6c2c11;
  --color-titian-red-900: #4c1e0b;
  --color-titian-red-950: #320d01;
}

SCSS

$titian-red: #c25621;
$titian-red-rgb: 194, 86, 33;
$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);
}