#B56026

CSS

:root {
  --polished-copper: #b56026;
  --polished-copper-rgb: 181 96 38;
  --polished-copper-oklch: oklch(0.579 0.13 51.1);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(24 65% 43%);
  border-color: oklch(0.579 0.13 51.1);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b56026;
  --color-polished-copper-50: #ffecd3;
  --color-polished-copper-100: #ffddc0;
  --color-polished-copper-200: #ffc6a0;
  --color-polished-copper-300: #eca577;
  --color-polished-copper-400: #db8653;
  --color-polished-copper-500: #c86926;
  --color-polished-copper-600: #a95923;
  --color-polished-copper-700: #88471c;
  --color-polished-copper-800: #653314;
  --color-polished-copper-900: #47220c;
  --color-polished-copper-950: #2e1102;
}

SCSS

$polished-copper: #b56026;
$polished-copper-rgb: 181, 96, 38;
$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);
}