#7D3929

CSS

:root {
  --ebi-brown: #7d3929;
  --ebi-brown-rgb: 125 57 41;
  --ebi-brown-oklch: oklch(0.431 0.099 34.5);
}

.element {
  color: var(--ebi-brown);
  background-color: hsl(11 51% 33%);
  border-color: oklch(0.431 0.099 34.5);
}

Tailwind CSS v4

@theme {
  --color-ebi-brown: #7d3929;
  --color-ebi-brown-50: #ffece2;
  --color-ebi-brown-100: #ffddd1;
  --color-ebi-brown-200: #fbc6b7;
  --color-ebi-brown-300: #e5a694;
  --color-ebi-brown-400: #d28977;
  --color-ebi-brown-500: #be6d59;
  --color-ebi-brown-600: #a15c4c;
  --color-ebi-brown-700: #814a3c;
  --color-ebi-brown-800: #60352c;
  --color-ebi-brown-900: #43241e;
  --color-ebi-brown-950: #2b130e;
}

SCSS

$ebi-brown: #7d3929;
$ebi-brown-rgb: 125, 57, 41;
$ebi-brown-light: mix(#fff, $ebi-brown, 20%);
$ebi-brown-dark: mix(#000, $ebi-brown, 20%);

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