#AD6129

CSS

:root {
  --polished-copper: #ad6129;
  --polished-copper-rgb: 173 97 41;
  --polished-copper-oklch: oklch(0.57 0.12 53.6);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(25 62% 42%);
  border-color: oklch(0.57 0.12 53.6);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #ad6129;
  --color-polished-copper-50: #ffedd5;
  --color-polished-copper-100: #ffdec2;
  --color-polished-copper-200: #fdc7a3;
  --color-polished-copper-300: #e7a77b;
  --color-polished-copper-400: #d58a57;
  --color-polished-copper-500: #c26d2d;
  --color-polished-copper-600: #a45d28;
  --color-polished-copper-700: #844a20;
  --color-polished-copper-800: #623517;
  --color-polished-copper-900: #45240e;
  --color-polished-copper-950: #2d1203;
}

SCSS

$polished-copper: #ad6129;
$polished-copper-rgb: 173, 97, 41;
$polished-copper-light: mix(#fff, $polished-copper, 20%);
$polished-copper-dark: mix(#000, $polished-copper, 20%);

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