#C95011

CSS

:root {
  --dark-orange: #c95011;
  --dark-orange-rgb: 201 80 17;
  --dark-orange-oklch: oklch(0.584 0.168 42.4);
}

.element {
  color: var(--dark-orange);
  background-color: hsl(21 84% 43%);
  border-color: oklch(0.584 0.168 42.4);
}

Tailwind CSS v4

@theme {
  --color-dark-orange: #c95011;
  --color-dark-orange-50: #ffe7ce;
  --color-dark-orange-100: #ffd7ba;
  --color-dark-orange-200: #ffbd99;
  --color-dark-orange-300: #fe9a6d;
  --color-dark-orange-400: #ee7846;
  --color-dark-orange-500: #dc5504;
  --color-dark-orange-600: #ba490c;
  --color-dark-orange-700: #963a0b;
  --color-dark-orange-800: #70280a;
  --color-dark-orange-900: #4f1b06;
  --color-dark-orange-950: #340a00;
}

SCSS

$dark-orange: #c95011;
$dark-orange-rgb: 201, 80, 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);
}