#C45511

CSS

:root {
  --dark-orange: #c45511;
  --dark-orange-rgb: 196 85 17;
  --dark-orange-oklch: oklch(0.583 0.159 45.4);
}

.element {
  color: var(--dark-orange);
  background-color: hsl(23 84% 42%);
  border-color: oklch(0.583 0.159 45.4);
}

Tailwind CSS v4

@theme {
  --color-dark-orange: #c45511;
  --color-dark-orange-50: #ffe8cf;
  --color-dark-orange-100: #ffd9bb;
  --color-dark-orange-200: #ffc099;
  --color-dark-orange-300: #f99d6e;
  --color-dark-orange-400: #e97c46;
  --color-dark-orange-500: #d75b04;
  --color-dark-orange-600: #b64e0d;
  --color-dark-orange-700: #923e0b;
  --color-dark-orange-800: #6d2b0a;
  --color-dark-orange-900: #4d1d06;
  --color-dark-orange-950: #330d00;
}

SCSS

$dark-orange: #c45511;
$dark-orange-rgb: 196, 85, 17;
$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);
}