#AD4881

CSS

:root {
  --our-little-secret: #ad4881;
  --our-little-secret-rgb: 173 72 129;
  --our-little-secret-oklch: oklch(0.552 0.147 348);
}

.element {
  color: var(--our-little-secret);
  background-color: hsl(326 41% 48%);
  border-color: oklch(0.552 0.147 348);
}

Tailwind CSS v4

@theme {
  --color-our-little-secret: #ad4881;
  --color-our-little-secret-50: #ffe5fb;
  --color-our-little-secret-100: #ffd5ef;
  --color-our-little-secret-200: #ffbbdd;
  --color-our-little-secret-300: #f098c2;
  --color-our-little-secret-400: #dc78ae;
  --color-our-little-secret-500: #c95797;
  --color-our-little-secret-600: #aa4a80;
  --color-our-little-secret-700: #893b66;
  --color-our-little-secret-800: #652a4d;
  --color-our-little-secret-900: #471c35;
  --color-our-little-secret-950: #2e0c21;
}

SCSS

$our-little-secret: #ad4881;
$our-little-secret-rgb: 173, 72, 129;
$our-little-secret-light: mix(#fff, $our-little-secret, 20%);
$our-little-secret-dark: mix(#000, $our-little-secret, 20%);

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