#18809E

CSS

:root {
  --ahoy-blue: #18809e;
  --ahoy-blue-rgb: 24 128 158;
  --ahoy-blue-oklch: oklch(0.559 0.098 223.2);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(193 74% 36%);
  border-color: oklch(0.559 0.098 223.2);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #18809e;
  --color-ahoy-blue-50: #d8fcff;
  --color-ahoy-blue-100: #c6f0ff;
  --color-ahoy-blue-200: #a7def4;
  --color-ahoy-blue-300: #7fc2de;
  --color-ahoy-blue-400: #55abc9;
  --color-ahoy-blue-500: #2094b6;
  --color-ahoy-blue-600: #1f7d99;
  --color-ahoy-blue-700: #19647b;
  --color-ahoy-blue-800: #0e4a5a;
  --color-ahoy-blue-900: #09333f;
  --color-ahoy-blue-950: #001f28;
}

SCSS

$ahoy-blue: #18809e;
$ahoy-blue-rgb: 24, 128, 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);
}