#C25212

CSS

:root {
  --dark-orange: #c25212;
  --dark-orange-rgb: 194 82 18;
  --dark-orange-oklch: oklch(0.576 0.159 44.3);
}

.element {
  color: var(--dark-orange);
  background-color: hsl(22 83% 42%);
  border-color: oklch(0.576 0.159 44.3);
}

Tailwind CSS v4

@theme {
  --color-dark-orange: #c25212;
  --color-dark-orange-50: #ffe8cf;
  --color-dark-orange-100: #ffd8bb;
  --color-dark-orange-200: #ffbf9a;
  --color-dark-orange-300: #fa9d6f;
  --color-dark-orange-400: #ea7c48;
  --color-dark-orange-500: #d85a0d;
  --color-dark-orange-600: #b64d12;
  --color-dark-orange-700: #923d0f;
  --color-dark-orange-800: #6e2b0c;
  --color-dark-orange-900: #4d1d07;
  --color-dark-orange-950: #330c00;
}

SCSS

$dark-orange: #c25212;
$dark-orange-rgb: 194, 82, 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);
}