#A2B2CC

CSS

:root {
  --over-the-moon: #a2b2cc;
  --over-the-moon-rgb: 162 178 204;
  --over-the-moon-oklch: oklch(0.76 0.041 260.1);
}

.element {
  color: var(--over-the-moon);
  background-color: hsl(217 29% 72%);
  border-color: oklch(0.76 0.041 260.1);
}

Tailwind CSS v4

@theme {
  --color-over-the-moon: #a2b2cc;
  --color-over-the-moon-50: #eff5ff;
  --color-over-the-moon-100: #e0e8f6;
  --color-over-the-moon-200: #cbd5e7;
  --color-over-the-moon-300: #acb8cd;
  --color-over-the-moon-400: #909fb8;
  --color-over-the-moon-500: #7687a2;
  --color-over-the-moon-600: #647289;
  --color-over-the-moon-700: #505b6e;
  --color-over-the-moon-800: #3a4351;
  --color-over-the-moon-900: #272e38;
  --color-over-the-moon-950: #161b23;
}

SCSS

$over-the-moon: #a2b2cc;
$over-the-moon-rgb: 162, 178, 204;
$over-the-moon-light: mix(#fff, $over-the-moon, 20%);
$over-the-moon-dark: mix(#000, $over-the-moon, 20%);

.element {
  color: $over-the-moon;
  box-shadow: 0 0 0 2px rgba($over-the-moon, 0.35);
}