#B4602B

CSS

:root {
  --polished-copper: #b4602b;
  --polished-copper-rgb: 180 96 43;
  --polished-copper-oklch: oklch(0.578 0.127 49.9);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(23 61% 44%);
  border-color: oklch(0.578 0.127 49.9);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b4602b;
  --color-polished-copper-50: #ffecd5;
  --color-polished-copper-100: #ffddc2;
  --color-polished-copper-200: #ffc6a3;
  --color-polished-copper-300: #eca57a;
  --color-polished-copper-400: #da8756;
  --color-polished-copper-500: #c7692d;
  --color-polished-copper-600: #a85928;
  --color-polished-copper-700: #87471f;
  --color-polished-copper-800: #653316;
  --color-polished-copper-900: #47230e;
  --color-polished-copper-950: #2e1103;
}

SCSS

$polished-copper: #b4602b;
$polished-copper-rgb: 180, 96, 43;
$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);
}