#B26224

CSS

:root {
  --polished-copper: #b26224;
  --polished-copper-rgb: 178 98 36;
  --polished-copper-oklch: oklch(0.578 0.127 54);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(26 66% 42%);
  border-color: oklch(0.578 0.127 54);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b26224;
  --color-polished-copper-50: #ffedd3;
  --color-polished-copper-100: #ffdec0;
  --color-polished-copper-200: #ffc7a0;
  --color-polished-copper-300: #e9a677;
  --color-polished-copper-400: #d88952;
  --color-polished-copper-500: #c56b24;
  --color-polished-copper-600: #a65b21;
  --color-polished-copper-700: #86491a;
  --color-polished-copper-800: #643413;
  --color-polished-copper-900: #46230c;
  --color-polished-copper-950: #2d1201;
}

SCSS

$polished-copper: #b26224;
$polished-copper-rgb: 178, 98, 36;
$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);
}