#6E93B2

CSS

:root {
  --heavenly-sky: #6e93b2;
  --heavenly-sky-rgb: 110 147 178;
  --heavenly-sky-oklch: oklch(0.647 0.062 244.2);
}

.element {
  color: var(--heavenly-sky);
  background-color: hsl(207 31% 56%);
  border-color: oklch(0.647 0.062 244.2);
}

Tailwind CSS v4

@theme {
  --color-heavenly-sky: #6e93b2;
  --color-heavenly-sky-50: #e7f7ff;
  --color-heavenly-sky-100: #d8ebfc;
  --color-heavenly-sky-200: #bfd8ee;
  --color-heavenly-sky-300: #9ebbd6;
  --color-heavenly-sky-400: #7fa3c1;
  --color-heavenly-sky-500: #628bad;
  --color-heavenly-sky-600: #547692;
  --color-heavenly-sky-700: #435e75;
  --color-heavenly-sky-800: #2f4556;
  --color-heavenly-sky-900: #20303c;
  --color-heavenly-sky-950: #0f1c26;
}

SCSS

$heavenly-sky: #6e93b2;
$heavenly-sky-rgb: 110, 147, 178;
$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);
}