#A690CC

CSS

:root {
  --petrified-purple: #a690cc;
  --petrified-purple-rgb: 166 144 204;
  --petrified-purple-oklch: oklch(0.695 0.089 300.9);
}

.element {
  color: var(--petrified-purple);
  background-color: hsl(262 37% 68%);
  border-color: oklch(0.695 0.089 300.9);
}

Tailwind CSS v4

@theme {
  --color-petrified-purple: #a690cc;
  --color-petrified-purple-50: #faf0ff;
  --color-petrified-purple-100: #eee1ff;
  --color-petrified-purple-200: #dcccf4;
  --color-petrified-purple-300: #c0adde;
  --color-petrified-purple-400: #a792cb;
  --color-petrified-purple-500: #9078b8;
  --color-petrified-purple-600: #7a669c;
  --color-petrified-purple-700: #62517d;
  --color-petrified-purple-800: #473b5d;
  --color-petrified-purple-900: #312941;
  --color-petrified-purple-950: #1d162a;
}

SCSS

$petrified-purple: #a690cc;
$petrified-purple-rgb: 166, 144, 204;
$petrified-purple-light: mix(#fff, $petrified-purple, 20%);
$petrified-purple-dark: mix(#000, $petrified-purple, 20%);

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