#C83533

CSS

:root {
  --smouldering-red: #c83533;
  --smouldering-red-rgb: 200 53 51;
  --smouldering-red-oklch: oklch(0.554 0.184 26.2);
}

.element {
  color: var(--smouldering-red);
  background-color: hsl(1 59% 49%);
  border-color: oklch(0.554 0.184 26.2);
}

Tailwind CSS v4

@theme {
  --color-smouldering-red: #c83533;
  --color-smouldering-red-50: #ffe2d8;
  --color-smouldering-red-100: #ffd1c6;
  --color-smouldering-red-200: #ffb6a8;
  --color-smouldering-red-300: #ff9081;
  --color-smouldering-red-400: #f86b62;
  --color-smouldering-red-500: #e7413e;
  --color-smouldering-red-600: #c33936;
  --color-smouldering-red-700: #9d2e2b;
  --color-smouldering-red-800: #751f20;
  --color-smouldering-red-900: #531515;
  --color-smouldering-red-950: #370507;
}

SCSS

$smouldering-red: #c83533;
$smouldering-red-rgb: 200, 53, 51;
$smouldering-red-light: mix(#fff, $smouldering-red, 20%);
$smouldering-red-dark: mix(#000, $smouldering-red, 20%);

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