#357296

CSS

:root {
  --harbour-blue: #357296;
  --harbour-blue-rgb: 53 114 150;
  --harbour-blue-oklch: oklch(0.528 0.085 237.3);
}

.element {
  color: var(--harbour-blue);
  background-color: hsl(202 48% 40%);
  border-color: oklch(0.528 0.085 237.3);
}

Tailwind CSS v4

@theme {
  --color-harbour-blue: #357296;
  --color-harbour-blue-50: #e0f9ff;
  --color-harbour-blue-100: #cfedff;
  --color-harbour-blue-200: #b4daf5;
  --color-harbour-blue-300: #90bedf;
  --color-harbour-blue-400: #6da6cb;
  --color-harbour-blue-500: #4a8eb7;
  --color-harbour-blue-600: #40789b;
  --color-harbour-blue-700: #33607c;
  --color-harbour-blue-800: #22475c;
  --color-harbour-blue-900: #173140;
  --color-harbour-blue-950: #071d29;
}

SCSS

$harbour-blue: #357296;
$harbour-blue-rgb: 53, 114, 150;
$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);
}