#B26127

CSS

:root {
  --polished-copper: #b26127;
  --polished-copper-rgb: 178 97 39;
  --polished-copper-oklch: oklch(0.577 0.126 52.5);
}

.element {
  color: var(--polished-copper);
  background-color: hsl(25 64% 43%);
  border-color: oklch(0.577 0.126 52.5);
}

Tailwind CSS v4

@theme {
  --color-polished-copper: #b26127;
  --color-polished-copper-50: #ffecd4;
  --color-polished-copper-100: #ffdec1;
  --color-polished-copper-200: #ffc6a1;
  --color-polished-copper-300: #eaa678;
  --color-polished-copper-400: #d88854;
  --color-polished-copper-500: #c56b28;
  --color-polished-copper-600: #a75b24;
  --color-polished-copper-700: #86481d;
  --color-polished-copper-800: #643414;
  --color-polished-copper-900: #46230d;
  --color-polished-copper-950: #2d1202;
}

SCSS

$polished-copper: #b26127;
$polished-copper-rgb: 178, 97, 39;
$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);
}