#A42A00

CSS

:root {
  --burnt-red: #a42a00;
  --burnt-red-rgb: 164 42 0;
  --burnt-red-oklch: oklch(0.476 0.164 35.7);
}

.element {
  color: var(--burnt-red);
  background-color: hsl(15 100% 32%);
  border-color: oklch(0.476 0.164 35.7);
}

Tailwind CSS v4

@theme {
  --color-burnt-red: #a42a00;
  --color-burnt-red-50: #ffe6d4;
  --color-burnt-red-100: #ffd6c1;
  --color-burnt-red-200: #ffbca2;
  --color-burnt-red-300: #ff9879;
  --color-burnt-red-400: #ee7657;
  --color-burnt-red-500: #dd522d;
  --color-burnt-red-600: #ba4728;
  --color-burnt-red-700: #963920;
  --color-burnt-red-800: #702718;
  --color-burnt-red-900: #4f1b0f;
  --color-burnt-red-950: #340a03;
}

SCSS

$burnt-red: #a42a00;
$burnt-red-rgb: 164, 42, 0;
$burnt-red-light: mix(#fff, $burnt-red, 20%);
$burnt-red-dark: mix(#000, $burnt-red, 20%);

.element {
  color: $burnt-red;
  box-shadow: 0 0 0 2px rgba($burnt-red, 0.35);
}