#297DAF

CSS

:root {
  --mediterranean-blue: #297daf;
  --mediterranean-blue-rgb: 41 125 175;
  --mediterranean-blue-oklch: oklch(0.563 0.11 239.6);
}

.element {
  color: var(--mediterranean-blue);
  background-color: hsl(202 62% 42%);
  border-color: oklch(0.563 0.11 239.6);
}

Tailwind CSS v4

@theme {
  --color-mediterranean-blue: #297daf;
  --color-mediterranean-blue-50: #dafaff;
  --color-mediterranean-blue-100: #c8edff;
  --color-mediterranean-blue-200: #abdbff;
  --color-mediterranean-blue-300: #84bfeb;
  --color-mediterranean-blue-400: #5ca7d9;
  --color-mediterranean-blue-500: #308fc7;
  --color-mediterranean-blue-600: #2b79a8;
  --color-mediterranean-blue-700: #226187;
  --color-mediterranean-blue-800: #144764;
  --color-mediterranean-blue-900: #0d3146;
  --color-mediterranean-blue-950: #011d2e;
}

SCSS

$mediterranean-blue: #297daf;
$mediterranean-blue-rgb: 41, 125, 175;
$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);
}