#D54800

CSS

:root {
  --mellow-mango: #d54800;
  --mellow-mango-rgb: 213 72 0;
  --mellow-mango-oklch: oklch(0.593 0.188 39.5);
}

.element {
  color: var(--mellow-mango);
  background-color: hsl(20 100% 42%);
  border-color: oklch(0.593 0.188 39.5);
}

Tailwind CSS v4

@theme {
  --color-mellow-mango: #d54800;
  --color-mellow-mango-50: #ffe4cc;
  --color-mellow-mango-100: #ffd4b7;
  --color-mellow-mango-200: #ffb994;
  --color-mellow-mango-300: #ff9467;
  --color-mellow-mango-400: #f76f3e;
  --color-mellow-mango-500: #e64700;
  --color-mellow-mango-600: #c23e00;
  --color-mellow-mango-700: #9c3200;
  --color-mellow-mango-800: #752203;
  --color-mellow-mango-900: #531703;
  --color-mellow-mango-950: #370600;
}

SCSS

$mellow-mango: #d54800;
$mellow-mango-rgb: 213, 72, 0;
$mellow-mango-light: mix(#fff, $mellow-mango, 20%);
$mellow-mango-dark: mix(#000, $mellow-mango, 20%);

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