#317F9D

CSS

:root {
  --ahoy-blue: #317f9d;
  --ahoy-blue-rgb: 49 127 157;
  --ahoy-blue-oklch: oklch(0.562 0.088 227.1);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(197 52% 40%);
  border-color: oklch(0.562 0.088 227.1);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #317f9d;
  --color-ahoy-blue-50: #dcfbff;
  --color-ahoy-blue-100: #cbeeff;
  --color-ahoy-blue-200: #aedcf3;
  --color-ahoy-blue-300: #88c1dc;
  --color-ahoy-blue-400: #62a9c7;
  --color-ahoy-blue-500: #3a92b3;
  --color-ahoy-blue-600: #337b97;
  --color-ahoy-blue-700: #286379;
  --color-ahoy-blue-800: #1a4959;
  --color-ahoy-blue-900: #11323e;
  --color-ahoy-blue-950: #031e28;
}

SCSS

$ahoy-blue: #317f9d;
$ahoy-blue-rgb: 49, 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);
}