#BC3D00

CSS

:root {
  --copper-hopper: #bc3d00;
  --copper-hopper-rgb: 188 61 0;
  --copper-hopper-oklch: oklch(0.538 0.172 39);
}

.element {
  color: var(--copper-hopper);
  background-color: hsl(19 100% 37%);
  border-color: oklch(0.538 0.172 39);
}

Tailwind CSS v4

@theme {
  --color-copper-hopper: #bc3d00;
  --color-copper-hopper-50: #ffe6d0;
  --color-copper-hopper-100: #ffd5bc;
  --color-copper-hopper-200: #ffbb9b;
  --color-copper-hopper-300: #ff9770;
  --color-copper-hopper-400: #f1754b;
  --color-copper-hopper-500: #df5015;
  --color-copper-hopper-600: #bd4516;
  --color-copper-hopper-700: #983712;
  --color-copper-hopper-800: #72260f;
  --color-copper-hopper-900: #501a09;
  --color-copper-hopper-950: #350900;
}

SCSS

$copper-hopper: #bc3d00;
$copper-hopper-rgb: 188, 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);
}