#0680A3

CSS

:root {
  --ahoy-blue: #0680a3;
  --ahoy-blue-rgb: 6 128 163;
  --ahoy-blue-oklch: oklch(0.559 0.105 225.8);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(193 93% 33%);
  border-color: oklch(0.559 0.105 225.8);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #0680a3;
  --color-ahoy-blue-50: #d7fcff;
  --color-ahoy-blue-100: #c4f0ff;
  --color-ahoy-blue-200: #a5def8;
  --color-ahoy-blue-300: #7bc2e2;
  --color-ahoy-blue-400: #50abce;
  --color-ahoy-blue-500: #0e94bb;
  --color-ahoy-blue-600: #147d9e;
  --color-ahoy-blue-700: #11647f;
  --color-ahoy-blue-800: #064a5d;
  --color-ahoy-blue-900: #053341;
  --color-ahoy-blue-950: #001f2a;
}

SCSS

$ahoy-blue: #0680a3;
$ahoy-blue-rgb: 6, 128, 163;
$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);
}