#65394D

CSS

:root {
  --passionate-plum: #65394d;
  --passionate-plum-rgb: 101 57 77;
  --passionate-plum-oklch: oklch(0.405 0.068 351.8);
}

.element {
  color: var(--passionate-plum);
  background-color: hsl(333 28% 31%);
  border-color: oklch(0.405 0.068 351.8);
}

Tailwind CSS v4

@theme {
  --color-passionate-plum: #65394d;
  --color-passionate-plum-50: #ffeef6;
  --color-passionate-plum-100: #fcdfe9;
  --color-passionate-plum-200: #edc9d6;
  --color-passionate-plum-300: #d4aaba;
  --color-passionate-plum-400: #bf8ea3;
  --color-passionate-plum-500: #aa738b;
  --color-passionate-plum-600: #8f6276;
  --color-passionate-plum-700: #734e5e;
  --color-passionate-plum-800: #553946;
  --color-passionate-plum-900: #3b2730;
  --color-passionate-plum-950: #25151c;
}

SCSS

$passionate-plum: #65394d;
$passionate-plum-rgb: 101, 57, 77;
$passionate-plum-light: mix(#fff, $passionate-plum, 20%);
$passionate-plum-dark: mix(#000, $passionate-plum, 20%);

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