#1B809C

CSS

:root {
  --ahoy-blue: #1b809c;
  --ahoy-blue-rgb: 27 128 156;
  --ahoy-blue-oklch: oklch(0.558 0.096 221.9);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(193 70% 36%);
  border-color: oklch(0.558 0.096 221.9);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #1b809c;
  --color-ahoy-blue-50: #d9fcff;
  --color-ahoy-blue-100: #c6f0ff;
  --color-ahoy-blue-200: #a8def3;
  --color-ahoy-blue-300: #80c3dc;
  --color-ahoy-blue-400: #57abc7;
  --color-ahoy-blue-500: #2394b3;
  --color-ahoy-blue-600: #227d98;
  --color-ahoy-blue-700: #1b647a;
  --color-ahoy-blue-800: #0f4a59;
  --color-ahoy-blue-900: #0a333e;
  --color-ahoy-blue-950: #001f28;
}

SCSS

$ahoy-blue: #1b809c;
$ahoy-blue-rgb: 27, 128, 156;
$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);
}