#AD6122

CSS

:root {
  --polished-copper: #ad6122;
  --polished-copper-rgb: 173 97 34;
  --polished-copper-oklch: oklch(0.57 0.123 55.7);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(27 67% 41%);
  border-color: oklch(0.57 0.123 55.7);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #ad6122;
  --color-polished-copper-50: #ffedd3;
  --color-polished-copper-100: #ffdfc0;
  --color-polished-copper-200: #fdc8a1;
  --color-polished-copper-300: #e7a878;
  --color-polished-copper-400: #d68a53;
  --color-polished-copper-500: #c26d26;
  --color-polished-copper-600: #a45d22;
  --color-polished-copper-700: #844a1b;
  --color-polished-copper-800: #633513;
  --color-polished-copper-900: #45240c;
  --color-polished-copper-950: #2d1201;
}

SCSS

$polished-copper: #ad6122;
$polished-copper-rgb: 173, 97, 34;
$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);
}