#3A3641

CSS

:root {
  --professor-plum: #3a3641;
  --professor-plum-rgb: 58 54 65;
  --professor-plum-oklch: oklch(0.341 0.02 301.9);
}

.element {
  color: var(--professor-plum);
  background-color: hsl(262 9% 23%);
  border-color: oklch(0.341 0.02 301.9);
}

Tailwind CSS v4

@theme {
  --color-professor-plum: #3a3641;
  --color-professor-plum-50: #f6f4fa;
  --color-professor-plum-100: #e9e6ed;
  --color-professor-plum-200: #d6d2db;
  --color-professor-plum-300: #b9b5c0;
  --color-professor-plum-400: #a09ca8;
  --color-professor-plum-500: #888391;
  --color-professor-plum-600: #736f7b;
  --color-professor-plum-700: #5c5962;
  --color-professor-plum-800: #434148;
  --color-professor-plum-900: #2e2d32;
  --color-professor-plum-950: #1b1a1e;
}

SCSS

$professor-plum: #3a3641;
$professor-plum-rgb: 58, 54, 65;
$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);
}