#B0CBF6

CSS

:root {
  --night-snow: #b0cbf6;
  --night-snow-rgb: 176 203 246;
  --night-snow-oklch: oklch(0.837 0.067 259.6);
}

.element {
  color: var(--night-snow);
  background-color: hsl(217 80% 83%);
  border-color: oklch(0.837 0.067 259.6);
}

Tailwind CSS v4

@theme {
  --color-night-snow: #b0cbf6;
  --color-night-snow-50: #ebf6ff;
  --color-night-snow-100: #dce9ff;
  --color-night-snow-200: #c5d5f2;
  --color-night-snow-300: #a5b8db;
  --color-night-snow-400: #87a0c7;
  --color-night-snow-500: #6c87b3;
  --color-night-snow-600: #5b7297;
  --color-night-snow-700: #495c79;
  --color-night-snow-800: #34435a;
  --color-night-snow-900: #232e3f;
  --color-night-snow-950: #121b28;
}

SCSS

$night-snow: #b0cbf6;
$night-snow-rgb: 176, 203, 246;
$night-snow-light: mix(#fff, $night-snow, 20%);
$night-snow-dark: mix(#000, $night-snow, 20%);

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