#B15F1A

CSS

:root {
  --polished-copper: #b15f1a;
  --polished-copper-rgb: 177 95 26;
  --polished-copper-oklch: oklch(0.571 0.131 54.7);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(27 74% 40%);
  border-color: oklch(0.571 0.131 54.7);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b15f1a;
  --color-polished-copper-50: #ffedd2;
  --color-polished-copper-100: #ffdebe;
  --color-polished-copper-200: #ffc79e;
  --color-polished-copper-300: #eba674;
  --color-polished-copper-400: #d9884e;
  --color-polished-copper-500: #c66a1b;
  --color-polished-copper-600: #a85a1b;
  --color-polished-copper-700: #874815;
  --color-polished-copper-800: #65330f;
  --color-polished-copper-900: #472309;
  --color-polished-copper-950: #2e1200;
}

SCSS

$polished-copper: #b15f1a;
$polished-copper-rgb: 177, 95, 26;
$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);
}