#B1BDDA

CSS

:root {
  --over-the-moon: #b1bdda;
  --over-the-moon-rgb: 177 189 218;
  --over-the-moon-oklch: oklch(0.799 0.043 267.6);
}

.element {
  color: var(--over-the-moon);
  background-color: hsl(222 36% 77%);
  border-color: oklch(0.799 0.043 267.6);
}

Tailwind CSS v4

@theme {
  --color-over-the-moon: #b1bdda;
  --color-over-the-moon-50: #f0f5ff;
  --color-over-the-moon-100: #e2e8f7;
  --color-over-the-moon-200: #cdd4e7;
  --color-over-the-moon-300: #aeb7ce;
  --color-over-the-moon-400: #939eb9;
  --color-over-the-moon-500: #7a86a4;
  --color-over-the-moon-600: #67718a;
  --color-over-the-moon-700: #525b6f;
  --color-over-the-moon-800: #3b4252;
  --color-over-the-moon-900: #292e39;
  --color-over-the-moon-950: #161b23;
}

SCSS

$over-the-moon: #b1bdda;
$over-the-moon-rgb: 177, 189, 218;
$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);
}