Celestial Blue

CSS

:root {
  --celestial-blue: #2c4d69;
  --celestial-blue-rgb: 44 77 105;
  --celestial-blue-oklch: oklch(0.408 0.061 245.7);
}

.element {
  color: var(--celestial-blue);
  background-color: hsl(208 41% 29%);
  border-color: oklch(0.408 0.061 245.7);
}

Tailwind CSS v4

@theme {
  --color-celestial-blue: #2c4d69;
  --color-celestial-blue-50: #e8f7ff;
  --color-celestial-blue-100: #d8eafc;
  --color-celestial-blue-200: #c0d7ee;
  --color-celestial-blue-300: #9fbbd6;
  --color-celestial-blue-400: #81a3c1;
  --color-celestial-blue-500: #648bad;
  --color-celestial-blue-600: #557592;
  --color-celestial-blue-700: #445e75;
  --color-celestial-blue-800: #304556;
  --color-celestial-blue-900: #20303c;
  --color-celestial-blue-950: #101c26;
}

SCSS

$celestial-blue: #2c4d69;
$celestial-blue-rgb: 44, 77, 105;
$celestial-blue-light: mix(#fff, $celestial-blue, 20%);
$celestial-blue-dark: mix(#000, $celestial-blue, 20%);

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