#2A809B

CSS

:root {
  --ahoy-blue: #2a809b;
  --ahoy-blue-rgb: 42 128 155;
  --ahoy-blue-oklch: oklch(0.561 0.09 223);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(194 57% 39%);
  border-color: oklch(0.561 0.09 223);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #2a809b;
  --color-ahoy-blue-50: #dbfbff;
  --color-ahoy-blue-100: #c9efff;
  --color-ahoy-blue-200: #acddf1;
  --color-ahoy-blue-300: #84c2da;
  --color-ahoy-blue-400: #5eaac5;
  --color-ahoy-blue-500: #3293b1;
  --color-ahoy-blue-600: #2d7c96;
  --color-ahoy-blue-700: #246378;
  --color-ahoy-blue-800: #174958;
  --color-ahoy-blue-900: #0f333e;
  --color-ahoy-blue-950: #021e27;
}

SCSS

$ahoy-blue: #2a809b;
$ahoy-blue-rgb: 42, 128, 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);
}