#6B3B6C

CSS

:root {
  --plum: #6b3b6c;
  --plum-rgb: 107 59 108;
  --plum-oklch: oklch(0.431 0.097 326.4);
}

.element {
  color: var(--plum);
  background-color: hsl(299 29% 33%);
  border-color: oklch(0.431 0.097 326.4);
}

Tailwind CSS v4

@theme {
  --color-plum: #6b3b6c;
  --color-plum-50: #ffecff;
  --color-plum-100: #fbddf8;
  --color-plum-200: #ecc6e9;
  --color-plum-300: #d3a6d1;
  --color-plum-400: #bd8abd;
  --color-plum-500: #a86ea8;
  --color-plum-600: #8e5e8e;
  --color-plum-700: #724b72;
  --color-plum-800: #533655;
  --color-plum-900: #3a253b;
  --color-plum-950: #241425;
}

SCSS

$plum: #6b3b6c;
$plum-rgb: 107, 59, 108;
$plum-light: mix(#fff, $plum, 20%);
$plum-dark: mix(#000, $plum, 20%);

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