#6068A0

CSS

:root {
  --twinkle-night: #6068a0;
  --twinkle-night-rgb: 96 104 160;
  --twinkle-night-oklch: oklch(0.535 0.088 276.8);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(233 25% 50%);
  border-color: oklch(0.535 0.088 276.8);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #6068a0;
  --color-twinkle-night-50: #eff3ff;
  --color-twinkle-night-100: #e1e6ff;
  --color-twinkle-night-200: #cbd1fa;
  --color-twinkle-night-300: #adb3e5;
  --color-twinkle-night-400: #919ad3;
  --color-twinkle-night-500: #7780c0;
  --color-twinkle-night-600: #656da2;
  --color-twinkle-night-700: #515782;
  --color-twinkle-night-800: #394061;
  --color-twinkle-night-900: #272c44;
  --color-twinkle-night-950: #15192c;
}

SCSS

$twinkle-night: #6068a0;
$twinkle-night-rgb: 96, 104, 160;
$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);
}