#D54400

CSS

:root {
  --mellow-mango: #d54400;
  --mellow-mango-rgb: 213 68 0;
  --mellow-mango-oklch: oklch(0.588 0.191 38.4);
}

.element {
  color: var(--mellow-mango);
  background-color: hsl(19 100% 42%);
  border-color: oklch(0.588 0.191 38.4);
}

Tailwind CSS v4

@theme {
  --color-mellow-mango: #d54400;
  --color-mellow-mango-50: #ffe4cc;
  --color-mellow-mango-100: #ffd3b7;
  --color-mellow-mango-200: #ffb895;
  --color-mellow-mango-300: #ff9268;
  --color-mellow-mango-400: #f96e40;
  --color-mellow-mango-500: #e84400;
  --color-mellow-mango-600: #c43c00;
  --color-mellow-mango-700: #9e3000;
  --color-mellow-mango-800: #762005;
  --color-mellow-mango-900: #531604;
  --color-mellow-mango-950: #370500;
}

SCSS

$mellow-mango: #d54400;
$mellow-mango-rgb: 213, 68, 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);
}