#BDC1E5

CSS

:root {
  --stardust-evening: #bdc1e5;
  --stardust-evening-rgb: 189 193 229;
  --stardust-evening-oklch: oklch(0.82 0.051 280.2);
}

.element {
  color: var(--stardust-evening);
  background-color: hsl(234 43% 82%);
  border-color: oklch(0.82 0.051 280.2);
}

Tailwind CSS v4

@theme {
  --color-stardust-evening: #bdc1e5;
  --color-stardust-evening-50: #f2f4ff;
  --color-stardust-evening-100: #e5e6f9;
  --color-stardust-evening-200: #d0d2ea;
  --color-stardust-evening-300: #b3b5d1;
  --color-stardust-evening-400: #989cbd;
  --color-stardust-evening-500: #7f83a8;
  --color-stardust-evening-600: #6c6f8e;
  --color-stardust-evening-700: #565972;
  --color-stardust-evening-800: #3e4154;
  --color-stardust-evening-900: #2b2d3b;
  --color-stardust-evening-950: #181a25;
}

SCSS

$stardust-evening: #bdc1e5;
$stardust-evening-rgb: 189, 193, 229;
$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);
}