#6E71B1

CSS

:root {
  --twinkle-night: #6e71b1;
  --twinkle-night-rgb: 110 113 177;
  --twinkle-night-oklch: oklch(0.573 0.098 280.8);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(237 30% 56%);
  border-color: oklch(0.573 0.098 280.8);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #6e71b1;
  --color-twinkle-night-50: #f0f2ff;
  --color-twinkle-night-100: #e2e4ff;
  --color-twinkle-night-200: #cdd0fe;
  --color-twinkle-night-300: #b0b2e9;
  --color-twinkle-night-400: #9498d7;
  --color-twinkle-night-500: #7b7ec6;
  --color-twinkle-night-600: #686ba7;
  --color-twinkle-night-700: #535586;
  --color-twinkle-night-800: #3b3e64;
  --color-twinkle-night-900: #282b46;
  --color-twinkle-night-950: #16182e;
}

SCSS

$twinkle-night: #6e71b1;
$twinkle-night-rgb: 110, 113, 177;
$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);
}