#B85E21

CSS

:root {
  --polished-copper: #b85e21;
  --polished-copper-rgb: 184 94 33;
  --polished-copper-oklch: oklch(0.58 0.136 50.2);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(24 70% 43%);
  border-color: oklch(0.58 0.136 50.2);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b85e21;
  --color-polished-copper-50: #ffebd2;
  --color-polished-copper-100: #ffdcbf;
  --color-polished-copper-200: #ffc49e;
  --color-polished-copper-300: #efa375;
  --color-polished-copper-400: #de854f;
  --color-polished-copper-500: #cb6620;
  --color-polished-copper-600: #ab571e;
  --color-polished-copper-700: #8a4518;
  --color-polished-copper-800: #673111;
  --color-polished-copper-900: #48220b;
  --color-polished-copper-950: #2f1001;
}

SCSS

$polished-copper: #b85e21;
$polished-copper-rgb: 184, 94, 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);
}