#B16221

CSS

:root {
  --polished-copper: #b16221;
  --polished-copper-rgb: 177 98 33;
  --polished-copper-oklch: oklch(0.577 0.127 55.2);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(27 69% 41%);
  border-color: oklch(0.577 0.127 55.2);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b16221;
  --color-polished-copper-50: #ffedd3;
  --color-polished-copper-100: #ffdebf;
  --color-polished-copper-200: #ffc79f;
  --color-polished-copper-300: #e9a776;
  --color-polished-copper-400: #d78950;
  --color-polished-copper-500: #c46c21;
  --color-polished-copper-600: #a65c1f;
  --color-polished-copper-700: #854919;
  --color-polished-copper-800: #643411;
  --color-polished-copper-900: #46240b;
  --color-polished-copper-950: #2d1201;
}

SCSS

$polished-copper: #b16221;
$polished-copper-rgb: 177, 98, 33;
$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);
}