#6A6FB3

CSS

:root {
  --twinkle-night: #6a6fb3;
  --twinkle-night-rgb: 106 111 179;
  --twinkle-night-oklch: oklch(0.567 0.105 279.3);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(236 32% 56%);
  border-color: oklch(0.567 0.105 279.3);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #6a6fb3;
  --color-twinkle-night-50: #eff2ff;
  --color-twinkle-night-100: #e1e5ff;
  --color-twinkle-night-200: #ccd0ff;
  --color-twinkle-night-300: #aeb2ec;
  --color-twinkle-night-400: #9198dc;
  --color-twinkle-night-500: #787eca;
  --color-twinkle-night-600: #666bab;
  --color-twinkle-night-700: #515589;
  --color-twinkle-night-800: #3a3e66;
  --color-twinkle-night-900: #272b48;
  --color-twinkle-night-950: #16182f;
}

SCSS

$twinkle-night: #6a6fb3;
$twinkle-night-rgb: 106, 111, 179;
$twinkle-night-light: mix(#fff, $twinkle-night, 20%);
$twinkle-night-dark: mix(#000, $twinkle-night, 20%);

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