#0A81A0

CSS

:root {
  --ahoy-blue: #0a81a0;
  --ahoy-blue-rgb: 10 129 160;
  --ahoy-blue-oklch: oklch(0.56 0.102 222.9);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(192 88% 33%);
  border-color: oklch(0.56 0.102 222.9);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #0a81a0;
  --color-ahoy-blue-50: #d7fcff;
  --color-ahoy-blue-100: #c4f0ff;
  --color-ahoy-blue-200: #a5def5;
  --color-ahoy-blue-300: #7cc3df;
  --color-ahoy-blue-400: #50acca;
  --color-ahoy-blue-500: #1094b7;
  --color-ahoy-blue-600: #157d9b;
  --color-ahoy-blue-700: #12647c;
  --color-ahoy-blue-800: #074a5b;
  --color-ahoy-blue-900: #063340;
  --color-ahoy-blue-950: #001f29;
}

SCSS

$ahoy-blue: #0a81a0;
$ahoy-blue-rgb: 10, 129, 160;
$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);
}