#6C3A44

CSS

:root {
  --red-rumour: #6c3a44;
  --red-rumour-rgb: 108 58 68;
  --red-rumour-oklch: oklch(0.414 0.071 7.9);
}

.element {
  color: var(--red-rumour);
  background-color: hsl(348 30% 33%);
  border-color: oklch(0.414 0.071 7.9);
}

Tailwind CSS v4

@theme {
  --color-red-rumour: #6c3a44;
  --color-red-rumour-50: #ffedf0;
  --color-red-rumour-100: #ffdfe2;
  --color-red-rumour-200: #f1c8cd;
  --color-red-rumour-300: #d9a9af;
  --color-red-rumour-400: #c48d96;
  --color-red-rumour-500: #af727d;
  --color-red-rumour-600: #94616a;
  --color-red-rumour-700: #774d55;
  --color-red-rumour-800: #58383f;
  --color-red-rumour-900: #3d262b;
  --color-red-rumour-950: #271518;
}

SCSS

$red-rumour: #6c3a44;
$red-rumour-rgb: 108, 58, 68;
$red-rumour-light: mix(#fff, $red-rumour, 20%);
$red-rumour-dark: mix(#000, $red-rumour, 20%);

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