#C35615

CSS

:root {
  --dark-orange: #c35615;
  --dark-orange-rgb: 195 86 21;
  --dark-orange-oklch: oklch(0.583 0.156 45.5);
}

.element {
  color: var(--dark-orange);
  background-color: hsl(22 81% 42%);
  border-color: oklch(0.583 0.156 45.5);
}

Tailwind CSS v4

@theme {
  --color-dark-orange: #c35615;
  --color-dark-orange-50: #ffe9cf;
  --color-dark-orange-100: #ffd9bb;
  --color-dark-orange-200: #ffc09a;
  --color-dark-orange-300: #f89e6f;
  --color-dark-orange-400: #e87d48;
  --color-dark-orange-500: #d65c0c;
  --color-dark-orange-600: #b54f11;
  --color-dark-orange-700: #913f0e;
  --color-dark-orange-800: #6d2c0b;
  --color-dark-orange-900: #4d1e07;
  --color-dark-orange-950: #320d00;
}

SCSS

$dark-orange: #c35615;
$dark-orange-rgb: 195, 86, 21;
$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);
}