#6C1731

CSS

:root {
  --plum-cheese: #6c1731;
  --plum-cheese-rgb: 108 23 49;
  --plum-cheese-oklch: oklch(0.358 0.119 7.6);
}

.element {
  color: var(--plum-cheese);
  background-color: hsl(342 65% 26%);
  border-color: oklch(0.358 0.119 7.6);
}

Tailwind CSS v4

@theme {
  --color-plum-cheese: #6c1731;
  --color-plum-cheese-50: #ffe8ee;
  --color-plum-cheese-100: #ffd8df;
  --color-plum-cheese-200: #ffc0c9;
  --color-plum-cheese-300: #ed9eaa;
  --color-plum-cheese-400: #da7f91;
  --color-plum-cheese-500: #c66178;
  --color-plum-cheese-600: #a85365;
  --color-plum-cheese-700: #874251;
  --color-plum-cheese-800: #642f3c;
  --color-plum-cheese-900: #462029;
  --color-plum-cheese-950: #2d0f17;
}

SCSS

$plum-cheese: #6c1731;
$plum-cheese-rgb: 108, 23, 49;
$plum-cheese-light: mix(#fff, $plum-cheese, 20%);
$plum-cheese-dark: mix(#000, $plum-cheese, 20%);

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