#377F9A

CSS

:root {
  --ahoy-blue: #377f9a;
  --ahoy-blue-rgb: 55 127 154;
  --ahoy-blue-oklch: oklch(0.562 0.082 225.8);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(196 47% 41%);
  border-color: oklch(0.562 0.082 225.8);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #377f9a;
  --color-ahoy-blue-50: #defaff;
  --color-ahoy-blue-100: #cceefe;
  --color-ahoy-blue-200: #b0dcf0;
  --color-ahoy-blue-300: #8bc0d9;
  --color-ahoy-blue-400: #66a9c4;
  --color-ahoy-blue-500: #4091b0;
  --color-ahoy-blue-600: #387b94;
  --color-ahoy-blue-700: #2c6277;
  --color-ahoy-blue-800: #1e4857;
  --color-ahoy-blue-900: #13323d;
  --color-ahoy-blue-950: #051e27;
}

SCSS

$ahoy-blue: #377f9a;
$ahoy-blue-rgb: 55, 127, 154;
$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);
}