#B5B9DB

CSS

:root {
  --stardust-evening: #b5b9db;
  --stardust-evening-rgb: 181 185 219;
  --stardust-evening-oklch: oklch(0.794 0.048 279.9);
}

.element {
  color: var(--stardust-evening);
  background-color: hsl(234 35% 78%);
  border-color: oklch(0.794 0.048 279.9);
}

Tailwind CSS v4

@theme {
  --color-stardust-evening: #b5b9db;
  --color-stardust-evening-50: #f2f4ff;
  --color-stardust-evening-100: #e5e6f8;
  --color-stardust-evening-200: #d0d2e9;
  --color-stardust-evening-300: #b3b5d0;
  --color-stardust-evening-400: #989cbb;
  --color-stardust-evening-500: #7f83a6;
  --color-stardust-evening-600: #6c6f8c;
  --color-stardust-evening-700: #565971;
  --color-stardust-evening-800: #3e4153;
  --color-stardust-evening-900: #2b2d3a;
  --color-stardust-evening-950: #181a24;
}

SCSS

$stardust-evening: #b5b9db;
$stardust-evening-rgb: 181, 185, 219;
$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);
}