#3D7E99

CSS

:root {
  --ahoy-blue: #3d7e99;
  --ahoy-blue-rgb: 61 126 153;
  --ahoy-blue-oklch: oklch(0.562 0.078 227.8);
}

.element {
  color: var(--ahoy-blue);
  background-color: hsl(198 43% 42%);
  border-color: oklch(0.562 0.078 227.8);
}

Tailwind CSS v4

@theme {
  --color-ahoy-blue: #3d7e99;
  --color-ahoy-blue-50: #dffaff;
  --color-ahoy-blue-100: #ceedfd;
  --color-ahoy-blue-200: #b3dbf0;
  --color-ahoy-blue-300: #8ec0d8;
  --color-ahoy-blue-400: #6ba8c3;
  --color-ahoy-blue-500: #4790af;
  --color-ahoy-blue-600: #3d7a94;
  --color-ahoy-blue-700: #316276;
  --color-ahoy-blue-800: #214857;
  --color-ahoy-blue-900: #16323d;
  --color-ahoy-blue-950: #071e26;
}

SCSS

$ahoy-blue: #3d7e99;
$ahoy-blue-rgb: 61, 126, 153;
$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);
}