#6972AF

CSS

:root {
  --twinkle-night: #6972af;
  --twinkle-night-rgb: 105 114 175;
  --twinkle-night-oklch: oklch(0.571 0.095 276.6);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(232 30% 55%);
  border-color: oklch(0.571 0.095 276.6);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #6972af;
  --color-twinkle-night-50: #eef3ff;
  --color-twinkle-night-100: #e0e5ff;
  --color-twinkle-night-200: #cbd1fd;
  --color-twinkle-night-300: #acb3e8;
  --color-twinkle-night-400: #909ad6;
  --color-twinkle-night-500: #7680c4;
  --color-twinkle-night-600: #646ca6;
  --color-twinkle-night-700: #505785;
  --color-twinkle-night-800: #384063;
  --color-twinkle-night-900: #272c46;
  --color-twinkle-night-950: #15192d;
}

SCSS

$twinkle-night: #6972af;
$twinkle-night-rgb: 105, 114, 175;
$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);
}