#A6B3DC

CSS

:root {
  --over-the-moon: #a6b3dc;
  --over-the-moon-rgb: 166 179 220;
  --over-the-moon-oklch: oklch(0.771 0.061 271.2);
}

.element {
  color: var(--over-the-moon);
  background-color: hsl(226 44% 76%);
  border-color: oklch(0.771 0.061 271.2);
}

Tailwind CSS v4

@theme {
  --color-over-the-moon: #a6b3dc;
  --color-over-the-moon-50: #eff4ff;
  --color-over-the-moon-100: #e1e7fd;
  --color-over-the-moon-200: #cbd3ef;
  --color-over-the-moon-300: #adb6d7;
  --color-over-the-moon-400: #919dc3;
  --color-over-the-moon-500: #7784af;
  --color-over-the-moon-600: #657094;
  --color-over-the-moon-700: #515a77;
  --color-over-the-moon-800: #3a4258;
  --color-over-the-moon-900: #282d3d;
  --color-over-the-moon-950: #161a27;
}

SCSS

$over-the-moon: #a6b3dc;
$over-the-moon-rgb: 166, 179, 220;
$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);
}