#BBC0EA

CSS

:root {
  --stardust-evening: #bbc0ea;
  --stardust-evening-rgb: 187 192 234;
  --stardust-evening-oklch: oklch(0.818 0.059 279.7);
}

.element {
  color: var(--stardust-evening);
  background-color: hsl(234 53% 83%);
  border-color: oklch(0.818 0.059 279.7);
}

Tailwind CSS v4

@theme {
  --color-stardust-evening: #bbc0ea;
  --color-stardust-evening-50: #f2f4ff;
  --color-stardust-evening-100: #e4e6fc;
  --color-stardust-evening-200: #cfd2ee;
  --color-stardust-evening-300: #b2b4d6;
  --color-stardust-evening-400: #979bc2;
  --color-stardust-evening-500: #7e82ad;
  --color-stardust-evening-600: #6a6e92;
  --color-stardust-evening-700: #555875;
  --color-stardust-evening-800: #3d4157;
  --color-stardust-evening-900: #2a2d3d;
  --color-stardust-evening-950: #181a26;
}

SCSS

$stardust-evening: #bbc0ea;
$stardust-evening-rgb: 187, 192, 234;
$stardust-evening-light: mix(#fff, $stardust-evening, 20%);
$stardust-evening-dark: mix(#000, $stardust-evening, 20%);

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