#367F9B

CSS

:root {
  --ahoy-blue: #367f9b;
  --ahoy-blue-rgb: 54 127 155;
  --ahoy-blue-oklch: oklch(0.562 0.084 226.5);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(197 48% 41%);
  border-color: oklch(0.562 0.084 226.5);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #367f9b;
  --color-ahoy-blue-50: #defbff;
  --color-ahoy-blue-100: #cceefe;
  --color-ahoy-blue-200: #b0dcf1;
  --color-ahoy-blue-300: #8ac0da;
  --color-ahoy-blue-400: #66a9c5;
  --color-ahoy-blue-500: #3f91b1;
  --color-ahoy-blue-600: #377b95;
  --color-ahoy-blue-700: #2c6278;
  --color-ahoy-blue-800: #1d4858;
  --color-ahoy-blue-900: #13323d;
  --color-ahoy-blue-950: #051e27;
}

SCSS

$ahoy-blue: #367f9b;
$ahoy-blue-rgb: 54, 127, 155;
$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);
}