#B06231

CSS

:root {
  --polished-copper: #b06231;
  --polished-copper-rgb: 176 98 49;
  --polished-copper-oklch: oklch(0.577 0.119 50.5);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(23 56% 44%);
  border-color: oklch(0.577 0.119 50.5);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b06231;
  --color-polished-copper-50: #ffedd6;
  --color-polished-copper-100: #ffdec4;
  --color-polished-copper-200: #fec7a6;
  --color-polished-copper-300: #e8a67e;
  --color-polished-copper-400: #d6895b;
  --color-polished-copper-500: #c36c34;
  --color-polished-copper-600: #a55c2e;
  --color-polished-copper-700: #844924;
  --color-polished-copper-800: #63341a;
  --color-polished-copper-900: #452411;
  --color-polished-copper-950: #2d1204;
}

SCSS

$polished-copper: #b06231;
$polished-copper-rgb: 176, 98, 49;
$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);
}