#A15A1A

CSS

:root {
  --chilli-con-carne: #a15a1a;
  --chilli-con-carne-rgb: 161 90 26;
  --chilli-con-carne-oklch: oklch(0.54 0.119 57.1);
}

.element {
  color: var(--chilli-con-carne);
  background-color: hsl(28 72% 37%);
  border-color: oklch(0.54 0.119 57.1);
}

Tailwind CSS v4

@theme {
  --color-chilli-con-carne: #a15a1a;
  --color-chilli-con-carne-50: #ffeed4;
  --color-chilli-con-carne-100: #ffdfc1;
  --color-chilli-con-carne-200: #fbc9a2;
  --color-chilli-con-carne-300: #e5a979;
  --color-chilli-con-carne-400: #d38c55;
  --color-chilli-con-carne-500: #c06f29;
  --color-chilli-con-carne-600: #a25e25;
  --color-chilli-con-carne-700: #824b1d;
  --color-chilli-con-carne-800: #613615;
  --color-chilli-con-carne-900: #44250d;
  --color-chilli-con-carne-950: #2c1302;
}

SCSS

$chilli-con-carne: #a15a1a;
$chilli-con-carne-rgb: 161, 90, 26;
$chilli-con-carne-light: mix(#fff, $chilli-con-carne, 20%);
$chilli-con-carne-dark: mix(#000, $chilli-con-carne, 20%);

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