#307F9E

CSS

:root {
  --ahoy-blue: #307f9e;
  --ahoy-blue-rgb: 48 127 158;
  --ahoy-blue-oklch: oklch(0.562 0.089 227.7);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(197 53% 40%);
  border-color: oklch(0.562 0.089 227.7);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #307f9e;
  --color-ahoy-blue-50: #dcfbff;
  --color-ahoy-blue-100: #caeeff;
  --color-ahoy-blue-200: #aedcf3;
  --color-ahoy-blue-300: #87c1dc;
  --color-ahoy-blue-400: #61a9c8;
  --color-ahoy-blue-500: #3991b4;
  --color-ahoy-blue-600: #327b98;
  --color-ahoy-blue-700: #28637a;
  --color-ahoy-blue-800: #1a495a;
  --color-ahoy-blue-900: #11323f;
  --color-ahoy-blue-950: #031e28;
}

SCSS

$ahoy-blue: #307f9e;
$ahoy-blue-rgb: 48, 127, 158;
$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);
}