#9DACCD

CSS

:root {
  --old-world: #9daccd;
  --old-world-rgb: 157 172 205;
  --old-world-oklch: oklch(0.744 0.051 265.9);
}

.element {
  color: var(--old-world);
  background-color: hsl(221 32% 71%);
  border-color: oklch(0.744 0.051 265.9);
}

Tailwind CSS v4

@theme {
  --color-old-world: #9daccd;
  --color-old-world-50: #eff5ff;
  --color-old-world-100: #e0e8fa;
  --color-old-world-200: #cbd4eb;
  --color-old-world-300: #acb7d2;
  --color-old-world-400: #909ebd;
  --color-old-world-500: #7686a9;
  --color-old-world-600: #64718e;
  --color-old-world-700: #505b72;
  --color-old-world-800: #394254;
  --color-old-world-900: #272e3b;
  --color-old-world-950: #151b25;
}

SCSS

$old-world: #9daccd;
$old-world-rgb: 157, 172, 205;
$old-world-light: mix(#fff, $old-world, 20%);
$old-world-dark: mix(#000, $old-world, 20%);

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