#47768D

CSS

:root {
  --harbour-blue: #47768d;
  --harbour-blue-rgb: 71 118 141;
  --harbour-blue-oklch: oklch(0.542 0.063 230.7);
}

.element {
  color: var(--harbour-blue);
  background-color: hsl(200 33% 42%);
  border-color: oklch(0.542 0.063 230.7);
}

Tailwind CSS v4

@theme {
  --color-harbour-blue: #47768d;
  --color-harbour-blue-50: #e4f9ff;
  --color-harbour-blue-100: #d4ecfa;
  --color-harbour-blue-200: #bbdaeb;
  --color-harbour-blue-300: #98bed3;
  --color-harbour-blue-400: #78a6bd;
  --color-harbour-blue-500: #598ea8;
  --color-harbour-blue-600: #4c788e;
  --color-harbour-blue-700: #3c6072;
  --color-harbour-blue-800: #2a4754;
  --color-harbour-blue-900: #1c313a;
  --color-harbour-blue-950: #0c1d24;
}

SCSS

$harbour-blue: #47768d;
$harbour-blue-rgb: 71, 118, 141;
$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);
}