#67346D

CSS

:root {
  --plum: #67346d;
  --plum-rgb: 103 52 109;
  --plum-oklch: oklch(0.414 0.109 323.3);
}

.element {
  color: var(--plum);
  background-color: hsl(294 35% 32%);
  border-color: oklch(0.414 0.109 323.3);
}

Tailwind CSS v4

@theme {
  --color-plum: #67346d;
  --color-plum-50: #ffebff;
  --color-plum-100: #fbdcfc;
  --color-plum-200: #edc5ee;
  --color-plum-300: #d4a4d6;
  --color-plum-400: #be88c4;
  --color-plum-500: #a96caf;
  --color-plum-600: #8e5c94;
  --color-plum-700: #724977;
  --color-plum-800: #533559;
  --color-plum-900: #3a243e;
  --color-plum-950: #241327;
}

SCSS

$plum: #67346d;
$plum-rgb: 103, 52, 109;
$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);
}