#C15722

CSS

:root {
  --titian-red: #c15722;
  --titian-red-rgb: 193 87 34;
  --titian-red-oklch: oklch(0.582 0.15 43.9);
}

.element {
  color: var(--titian-red);
  background-color: hsl(20 70% 45%);
  border-color: oklch(0.582 0.15 43.9);
}

Tailwind CSS v4

@theme {
  --color-titian-red: #c15722;
  --color-titian-red-50: #ffe9d2;
  --color-titian-red-100: #ffd9be;
  --color-titian-red-200: #ffc09e;
  --color-titian-red-300: #f79e74;
  --color-titian-red-400: #e67e4f;
  --color-titian-red-500: #d45d20;
  --color-titian-red-600: #b3501e;
  --color-titian-red-700: #904018;
  --color-titian-red-800: #6c2d12;
  --color-titian-red-900: #4c1e0b;
  --color-titian-red-950: #320d01;
}

SCSS

$titian-red: #c15722;
$titian-red-rgb: 193, 87, 34;
$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);
}