#337DAB

CSS

:root {
  --mediterranean-blue: #337dab;
  --mediterranean-blue-rgb: 51 125 171;
  --mediterranean-blue-oklch: oklch(0.564 0.102 239.5);
}

.element {
  color: var(--mediterranean-blue);
  background-color: hsl(203 54% 44%);
  border-color: oklch(0.564 0.102 239.5);
}

Tailwind CSS v4

@theme {
  --color-mediterranean-blue: #337dab;
  --color-mediterranean-blue-50: #ddfaff;
  --color-mediterranean-blue-100: #cbedff;
  --color-mediterranean-blue-200: #aedafc;
  --color-mediterranean-blue-300: #88bee7;
  --color-mediterranean-blue-400: #62a7d4;
  --color-mediterranean-blue-500: #3b8ec2;
  --color-mediterranean-blue-600: #3479a4;
  --color-mediterranean-blue-700: #296084;
  --color-mediterranean-blue-800: #1a4761;
  --color-mediterranean-blue-900: #113144;
  --color-mediterranean-blue-950: #031d2c;
}

SCSS

$mediterranean-blue: #337dab;
$mediterranean-blue-rgb: 51, 125, 171;
$mediterranean-blue-light: mix(#fff, $mediterranean-blue, 20%);
$mediterranean-blue-dark: mix(#000, $mediterranean-blue, 20%);

.element {
  color: $mediterranean-blue;
  box-shadow: 0 0 0 2px rgba($mediterranean-blue, 0.35);
}