#C55400

CSS

:root {
  --dark-orange: #c55400;
  --dark-orange-rgb: 197 84 0;
  --dark-orange-oklch: oklch(0.583 0.163 46.4);
}

.element {
  color: var(--dark-orange);
  background-color: hsl(26 100% 39%);
  border-color: oklch(0.583 0.163 46.4);
}

Tailwind CSS v4

@theme {
  --color-dark-orange: #c55400;
  --color-dark-orange-50: #ffe8cd;
  --color-dark-orange-100: #ffd8b9;
  --color-dark-orange-200: #ffbf97;
  --color-dark-orange-300: #fa9d6a;
  --color-dark-orange-400: #ea7c41;
  --color-dark-orange-500: #d85a00;
  --color-dark-orange-600: #b74d00;
  --color-dark-orange-700: #933d02;
  --color-dark-orange-800: #6e2b05;
  --color-dark-orange-900: #4e1d04;
  --color-dark-orange-950: #330c00;
}

SCSS

$dark-orange: #c55400;
$dark-orange-rgb: 197, 84, 0;
$dark-orange-light: mix(#fff, $dark-orange, 20%);
$dark-orange-dark: mix(#000, $dark-orange, 20%);

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