#B15F26

CSS

:root {
  --polished-copper: #b15f26;
  --polished-copper-rgb: 177 95 38;
  --polished-copper-oklch: oklch(0.572 0.127 51.7);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(25 65% 42%);
  border-color: oklch(0.572 0.127 51.7);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b15f26;
  --color-polished-copper-50: #ffecd4;
  --color-polished-copper-100: #ffddc1;
  --color-polished-copper-200: #ffc6a2;
  --color-polished-copper-300: #eba679;
  --color-polished-copper-400: #d98754;
  --color-polished-copper-500: #c66a29;
  --color-polished-copper-600: #a75a25;
  --color-polished-copper-700: #86481d;
  --color-polished-copper-800: #643315;
  --color-polished-copper-900: #47230d;
  --color-polished-copper-950: #2e1202;
}

SCSS

$polished-copper: #b15f26;
$polished-copper-rgb: 177, 95, 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);
}