#6C70B6

CSS

:root {
  --twinkle-night: #6c70b6;
  --twinkle-night-rgb: 108 112 182;
  --twinkle-night-oklch: oklch(0.572 0.107 279.9);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(237 34% 57%);
  border-color: oklch(0.572 0.107 279.9);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #6c70b6;
  --color-twinkle-night-50: #f0f2ff;
  --color-twinkle-night-100: #e1e4ff;
  --color-twinkle-night-200: #cccfff;
  --color-twinkle-night-300: #aeb1ed;
  --color-twinkle-night-400: #9297dd;
  --color-twinkle-night-500: #797dcc;
  --color-twinkle-night-600: #666aac;
  --color-twinkle-night-700: #52558a;
  --color-twinkle-night-800: #3a3e67;
  --color-twinkle-night-900: #282b48;
  --color-twinkle-night-950: #16182f;
}

SCSS

$twinkle-night: #6c70b6;
$twinkle-night-rgb: 108, 112, 182;
$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);
}