#C45018

CSS

:root {
  --titian-red: #c45018;
  --titian-red-rgb: 196 80 24;
  --titian-red-oklch: oklch(0.576 0.162 42.1);
}

.element {
  color: var(--titian-red);
  background-color: hsl(20 78% 43%);
  border-color: oklch(0.576 0.162 42.1);
}

Tailwind CSS v4

@theme {
  --color-titian-red: #c45018;
  --color-titian-red-50: #ffe7d0;
  --color-titian-red-100: #ffd7bc;
  --color-titian-red-200: #ffbe9b;
  --color-titian-red-300: #fc9b71;
  --color-titian-red-400: #ec7a4b;
  --color-titian-red-500: #da5716;
  --color-titian-red-600: #b84b17;
  --color-titian-red-700: #943c13;
  --color-titian-red-800: #6f2a0e;
  --color-titian-red-900: #4e1c09;
  --color-titian-red-950: #330b00;
}

SCSS

$titian-red: #c45018;
$titian-red-rgb: 196, 80, 24;
$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);
}