#B25E18

CSS

:root {
  --polished-copper: #b25e18;
  --polished-copper-rgb: 178 94 24;
  --polished-copper-oklch: oklch(0.571 0.133 54);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(27 76% 40%);
  border-color: oklch(0.571 0.133 54);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b25e18;
  --color-polished-copper-50: #ffecd1;
  --color-polished-copper-100: #ffddbe;
  --color-polished-copper-200: #ffc69d;
  --color-polished-copper-300: #eca573;
  --color-polished-copper-400: #da874d;
  --color-polished-copper-500: #c86919;
  --color-polished-copper-600: #a95a19;
  --color-polished-copper-700: #874814;
  --color-polished-copper-800: #65330e;
  --color-polished-copper-900: #472309;
  --color-polished-copper-950: #2e1100;
}

SCSS

$polished-copper: #b25e18;
$polished-copper-rgb: 178, 94, 24;
$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);
}