#903F2D

CSS

:root {
  --fire: #903f2d;
  --fire-rgb: 144 63 45;
  --fire-oklch: oklch(0.472 0.114 34);
}

.element {
  color: var(--fire);
  background-color: hsl(11 52% 37%);
  border-color: oklch(0.472 0.114 34);
}

Tailwind CSS v4

@theme {
  --color-fire: #903f2d;
  --color-fire-50: #ffeadf;
  --color-fire-100: #ffdbce;
  --color-fire-200: #ffc4b3;
  --color-fire-300: #eba38f;
  --color-fire-400: #d98571;
  --color-fire-500: #c66752;
  --color-fire-600: #a75846;
  --color-fire-700: #864637;
  --color-fire-800: #643228;
  --color-fire-900: #46221b;
  --color-fire-950: #2d110c;
}

SCSS

$fire: #903f2d;
$fire-rgb: 144, 63, 45;
$fire-light: mix(#fff, $fire, 20%);
$fire-dark: mix(#000, $fire, 20%);

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