#B73D00

CSS

:root {
  --copper-hopper: #b73d00;
  --copper-hopper-rgb: 183 61 0;
  --copper-hopper-oklch: oklch(0.53 0.167 39.7);
}

.element {
  color: var(--copper-hopper);
  background-color: hsl(20 100% 36%);
  border-color: oklch(0.53 0.167 39.7);
}

Tailwind CSS v4

@theme {
  --color-copper-hopper: #b73d00;
  --color-copper-hopper-50: #ffe6d0;
  --color-copper-hopper-100: #ffd6bd;
  --color-copper-hopper-200: #ffbc9c;
  --color-copper-hopper-300: #ff9971;
  --color-copper-hopper-400: #ef774c;
  --color-copper-hopper-500: #dd5319;
  --color-copper-hopper-600: #bb4719;
  --color-copper-hopper-700: #963914;
  --color-copper-hopper-800: #702810;
  --color-copper-hopper-900: #4f1b0a;
  --color-copper-hopper-950: #340a00;
}

SCSS

$copper-hopper: #b73d00;
$copper-hopper-rgb: 183, 61, 0;
$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);
}