#6A8BAC

CSS

:root {
  --heavenly-sky: #6a8bac;
  --heavenly-sky-rgb: 106 139 172;
  --heavenly-sky-oklch: oklch(0.624 0.062 248.9);
}

.element {
  color: var(--heavenly-sky);
  background-color: hsl(210 28% 55%);
  border-color: oklch(0.624 0.062 248.9);
}

Tailwind CSS v4

@theme {
  --color-heavenly-sky: #6a8bac;
  --color-heavenly-sky-50: #e8f7ff;
  --color-heavenly-sky-100: #d9eafd;
  --color-heavenly-sky-200: #c1d7ef;
  --color-heavenly-sky-300: #a0bad7;
  --color-heavenly-sky-400: #82a2c2;
  --color-heavenly-sky-500: #658aae;
  --color-heavenly-sky-600: #567593;
  --color-heavenly-sky-700: #455d76;
  --color-heavenly-sky-800: #314557;
  --color-heavenly-sky-900: #212f3d;
  --color-heavenly-sky-950: #101c26;
}

SCSS

$heavenly-sky: #6a8bac;
$heavenly-sky-rgb: 106, 139, 172;
$heavenly-sky-light: mix(#fff, $heavenly-sky, 20%);
$heavenly-sky-dark: mix(#000, $heavenly-sky, 20%);

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