#65396A

CSS

:root {
  --plum: #65396a;
  --plum-rgb: 101 57 106;
  --plum-oklch: oklch(0.418 0.095 323.3);
}

.element {
  color: var(--plum);
  background-color: hsl(294 30% 32%);
  border-color: oklch(0.418 0.095 323.3);
}

Tailwind CSS v4

@theme {
  --color-plum: #65396a;
  --color-plum-50: #ffecff;
  --color-plum-100: #f9defa;
  --color-plum-200: #eac7eb;
  --color-plum-300: #d1a7d2;
  --color-plum-400: #ba8bbf;
  --color-plum-500: #a570aa;
  --color-plum-600: #8b5f90;
  --color-plum-700: #6f4c73;
  --color-plum-800: #513756;
  --color-plum-900: #39263c;
  --color-plum-950: #231426;
}

SCSS

$plum: #65396a;
$plum-rgb: 101, 57, 106;
$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);
}