#337F9D

CSS

:root {
  --ahoy-blue: #337f9d;
  --ahoy-blue-rgb: 51 127 157;
  --ahoy-blue-oklch: oklch(0.562 0.087 227.5);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(197 51% 41%);
  border-color: oklch(0.562 0.087 227.5);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #337f9d;
  --color-ahoy-blue-50: #ddfbff;
  --color-ahoy-blue-100: #cbeeff;
  --color-ahoy-blue-200: #afdcf2;
  --color-ahoy-blue-300: #89c0db;
  --color-ahoy-blue-400: #63a9c7;
  --color-ahoy-blue-500: #3c91b3;
  --color-ahoy-blue-600: #347b97;
  --color-ahoy-blue-700: #2a6279;
  --color-ahoy-blue-800: #1b4959;
  --color-ahoy-blue-900: #12323e;
  --color-ahoy-blue-950: #041e28;
}

SCSS

$ahoy-blue: #337f9d;
$ahoy-blue-rgb: 51, 127, 157;
$ahoy-blue-light: mix(#fff, $ahoy-blue, 20%);
$ahoy-blue-dark: mix(#000, $ahoy-blue, 20%);

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