#AC4A79

CSS

:root {
  --our-little-secret: #ac4a79;
  --our-little-secret-rgb: 172 74 121;
  --our-little-secret-oklch: oklch(0.55 0.138 352.7);
}

.element {
  color: var(--our-little-secret);
  background-color: hsl(331 40% 48%);
  border-color: oklch(0.55 0.138 352.7);
}

Tailwind CSS v4

@theme {
  --color-our-little-secret: #ac4a79;
  --color-our-little-secret-50: #ffe6f7;
  --color-our-little-secret-100: #ffd5ea;
  --color-our-little-secret-200: #ffbcd8;
  --color-our-little-secret-300: #ef99bb;
  --color-our-little-secret-400: #dc7aa6;
  --color-our-little-secret-500: #c95a8f;
  --color-our-little-secret-600: #aa4d79;
  --color-our-little-secret-700: #883d61;
  --color-our-little-secret-800: #652c48;
  --color-our-little-secret-900: #471d32;
  --color-our-little-secret-950: #2e0d1e;
}

SCSS

$our-little-secret: #ac4a79;
$our-little-secret-rgb: 172, 74, 121;
$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);
}