#63353F

CSS

:root {
  --red-rumour: #63353f;
  --red-rumour-rgb: 99 53 63;
  --red-rumour-oklch: oklch(0.39 0.067 6.7);
}

.element {
  color: var(--red-rumour);
  background-color: hsl(347 30% 30%);
  border-color: oklch(0.39 0.067 6.7);
}

Tailwind CSS v4

@theme {
  --color-red-rumour: #63353f;
  --color-red-rumour-50: #ffeef1;
  --color-red-rumour-100: #fddfe3;
  --color-red-rumour-200: #efc9ce;
  --color-red-rumour-300: #d7aab0;
  --color-red-rumour-400: #c28e98;
  --color-red-rumour-500: #ad747f;
  --color-red-rumour-600: #92626b;
  --color-red-rumour-700: #754e56;
  --color-red-rumour-800: #56393f;
  --color-red-rumour-900: #3c272c;
  --color-red-rumour-950: #261519;
}

SCSS

$red-rumour: #63353f;
$red-rumour-rgb: 99, 53, 63;
$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);
}