#337295

CSS

:root {
  --harbour-blue: #337295;
  --harbour-blue-rgb: 51 114 149;
  --harbour-blue-oklch: oklch(0.526 0.085 235.9);
}

.element {
  color: var(--harbour-blue);
  background-color: hsl(201 49% 39%);
  border-color: oklch(0.526 0.085 235.9);
}

Tailwind CSS v4

@theme {
  --color-harbour-blue: #337295;
  --color-harbour-blue-50: #e0f9ff;
  --color-harbour-blue-100: #cfedff;
  --color-harbour-blue-200: #b3daf5;
  --color-harbour-blue-300: #8fbede;
  --color-harbour-blue-400: #6ca7ca;
  --color-harbour-blue-500: #488fb7;
  --color-harbour-blue-600: #3e799a;
  --color-harbour-blue-700: #31617c;
  --color-harbour-blue-800: #21475b;
  --color-harbour-blue-900: #163140;
  --color-harbour-blue-950: #071d29;
}

SCSS

$harbour-blue: #337295;
$harbour-blue-rgb: 51, 114, 149;
$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);
}