#2F7393

CSS

:root {
  --harbour-blue: #2f7393;
  --harbour-blue-rgb: 47 115 147;
  --harbour-blue-oklch: oklch(0.526 0.084 232);
}

.element {
  color: var(--harbour-blue);
  background-color: hsl(199 52% 38%);
  border-color: oklch(0.526 0.084 232);
}

Tailwind CSS v4

@theme {
  --color-harbour-blue: #2f7393;
  --color-harbour-blue-50: #dffaff;
  --color-harbour-blue-100: #cdedff;
  --color-harbour-blue-200: #b2dbf3;
  --color-harbour-blue-300: #8dbfdc;
  --color-harbour-blue-400: #69a8c8;
  --color-harbour-blue-500: #4490b4;
  --color-harbour-blue-600: #3b7a98;
  --color-harbour-blue-700: #2f617a;
  --color-harbour-blue-800: #1f485a;
  --color-harbour-blue-900: #15323f;
  --color-harbour-blue-950: #061e28;
}

SCSS

$harbour-blue: #2f7393;
$harbour-blue-rgb: 47, 115, 147;
$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);
}