#698CAC

CSS

:root {
  --heavenly-sky: #698cac;
  --heavenly-sky-rgb: 105 140 172;
  --heavenly-sky-oklch: oklch(0.626 0.062 246.6);
}

.element {
  color: var(--heavenly-sky);
  background-color: hsl(209 29% 54%);
  border-color: oklch(0.626 0.062 246.6);
}

Tailwind CSS v4

@theme {
  --color-heavenly-sky: #698cac;
  --color-heavenly-sky-50: #e8f7ff;
  --color-heavenly-sky-100: #d8eafc;
  --color-heavenly-sky-200: #c0d7ee;
  --color-heavenly-sky-300: #9fbbd7;
  --color-heavenly-sky-400: #81a3c2;
  --color-heavenly-sky-500: #648aae;
  --color-heavenly-sky-600: #557593;
  --color-heavenly-sky-700: #445e76;
  --color-heavenly-sky-800: #304557;
  --color-heavenly-sky-900: #20303d;
  --color-heavenly-sky-950: #101c26;
}

SCSS

$heavenly-sky: #698cac;
$heavenly-sky-rgb: 105, 140, 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);
}