#BC460E

CSS

:root {
  --copper-hopper: #bc460e;
  --copper-hopper-rgb: 188 70 14;
  --copper-hopper-oklch: oklch(0.55 0.163 40.7);
}

.element {
  color: var(--copper-hopper);
  background-color: hsl(19 86% 40%);
  border-color: oklch(0.55 0.163 40.7);
}

Tailwind CSS v4

@theme {
  --color-copper-hopper: #bc460e;
  --color-copper-hopper-50: #ffe7d1;
  --color-copper-hopper-100: #ffd7bd;
  --color-copper-hopper-200: #ffbd9c;
  --color-copper-hopper-300: #fd9a72;
  --color-copper-hopper-400: #ed784d;
  --color-copper-hopper-500: #db561a;
  --color-copper-hopper-600: #b94a1a;
  --color-copper-hopper-700: #953b15;
  --color-copper-hopper-800: #6f2910;
  --color-copper-hopper-900: #4e1c0a;
  --color-copper-hopper-950: #340b00;
}

SCSS

$copper-hopper: #bc460e;
$copper-hopper-rgb: 188, 70, 14;
$copper-hopper-light: mix(#fff, $copper-hopper, 20%);
$copper-hopper-dark: mix(#000, $copper-hopper, 20%);

.element {
  color: $copper-hopper;
  box-shadow: 0 0 0 2px rgba($copper-hopper, 0.35);
}