#AACCF7

CSS

:root {
  --night-snow: #aaccf7;
  --night-snow-rgb: 170 204 247;
  --night-snow-oklch: oklch(0.835 0.071 254.5);
}

.element {
  color: var(--night-snow);
  background-color: hsl(214 83% 82%);
  border-color: oklch(0.835 0.071 254.5);
}

Tailwind CSS v4

@theme {
  --color-night-snow: #aaccf7;
  --color-night-snow-50: #e8f6ff;
  --color-night-snow-100: #d9e9ff;
  --color-night-snow-200: #c1d6f3;
  --color-night-snow-300: #a0b9dc;
  --color-night-snow-400: #82a1c8;
  --color-night-snow-500: #6689b5;
  --color-night-snow-600: #567499;
  --color-night-snow-700: #455d7a;
  --color-night-snow-800: #30445a;
  --color-night-snow-900: #212f3f;
  --color-night-snow-950: #101b28;
}

SCSS

$night-snow: #aaccf7;
$night-snow-rgb: 170, 204, 247;
$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);
}