#C45012

CSS

:root {
  --dark-orange: #c45012;
  --dark-orange-rgb: 196 80 18;
  --dark-orange-oklch: oklch(0.576 0.163 43.1);
}

.element {
  color: var(--dark-orange);
  background-color: hsl(21 83% 42%);
  border-color: oklch(0.576 0.163 43.1);
}

Tailwind CSS v4

@theme {
  --color-dark-orange: #c45012;
  --color-dark-orange-50: #ffe7cf;
  --color-dark-orange-100: #ffd8bb;
  --color-dark-orange-200: #ffbe9a;
  --color-dark-orange-300: #fc9b6f;
  --color-dark-orange-400: #ec7a48;
  --color-dark-orange-500: #da570d;
  --color-dark-orange-600: #b84b12;
  --color-dark-orange-700: #943c0f;
  --color-dark-orange-800: #6f2a0c;
  --color-dark-orange-900: #4e1c07;
  --color-dark-orange-950: #330b00;
}

SCSS

$dark-orange: #c45012;
$dark-orange-rgb: 196, 80, 18;
$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);
}