#327392

CSS

:root {
  --harbour-blue: #327392;
  --harbour-blue-rgb: 50 115 146;
  --harbour-blue-oklch: oklch(0.527 0.082 231.9);
}

.element {
  color: var(--harbour-blue);
  background-color: hsl(199 49% 38%);
  border-color: oklch(0.527 0.082 231.9);
}

Tailwind CSS v4

@theme {
  --color-harbour-blue: #327392;
  --color-harbour-blue-50: #dffaff;
  --color-harbour-blue-100: #ceedff;
  --color-harbour-blue-200: #b3dbf2;
  --color-harbour-blue-300: #8ebfdb;
  --color-harbour-blue-400: #6ba7c7;
  --color-harbour-blue-500: #4790b3;
  --color-harbour-blue-600: #3d7a97;
  --color-harbour-blue-700: #316179;
  --color-harbour-blue-800: #214859;
  --color-harbour-blue-900: #16323e;
  --color-harbour-blue-950: #071d28;
}

SCSS

$harbour-blue: #327392;
$harbour-blue-rgb: 50, 115, 146;
$harbour-blue-light: mix(#fff, $harbour-blue, 20%);
$harbour-blue-dark: mix(#000, $harbour-blue, 20%);

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