#383542

CSS

:root {
  --professor-plum: #383542;
  --professor-plum-rgb: 56 53 66;
  --professor-plum-oklch: oklch(0.337 0.023 295.7);
}

.element {
  color: var(--professor-plum);
  background-color: hsl(254 11% 23%);
  border-color: oklch(0.337 0.023 295.7);
}

Tailwind CSS v4

@theme {
  --color-professor-plum: #383542;
  --color-professor-plum-50: #f6f4fb;
  --color-professor-plum-100: #e8e6ef;
  --color-professor-plum-200: #d5d2dd;
  --color-professor-plum-300: #b8b5c2;
  --color-professor-plum-400: #9f9cab;
  --color-professor-plum-500: #878394;
  --color-professor-plum-600: #726f7d;
  --color-professor-plum-700: #5b5964;
  --color-professor-plum-800: #43414a;
  --color-professor-plum-900: #2e2d33;
  --color-professor-plum-950: #1b1a1f;
}

SCSS

$professor-plum: #383542;
$professor-plum-rgb: 56, 53, 66;
$professor-plum-light: mix(#fff, $professor-plum, 20%);
$professor-plum-dark: mix(#000, $professor-plum, 20%);

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