#B26221

CSS

:root {
  --polished-copper: #b26221;
  --polished-copper-rgb: 178 98 33;
  --polished-copper-oklch: oklch(0.578 0.128 54.8);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(27 69% 41%);
  border-color: oklch(0.578 0.128 54.8);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b26221;
  --color-polished-copper-50: #ffedd2;
  --color-polished-copper-100: #ffdebf;
  --color-polished-copper-200: #ffc79f;
  --color-polished-copper-300: #e9a775;
  --color-polished-copper-400: #d88950;
  --color-polished-copper-500: #c56b20;
  --color-polished-copper-600: #a65b1e;
  --color-polished-copper-700: #864918;
  --color-polished-copper-800: #643411;
  --color-polished-copper-900: #46230b;
  --color-polished-copper-950: #2d1201;
}

SCSS

$polished-copper: #b26221;
$polished-copper-rgb: 178, 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);
}