#157DB3

CSS

:root {
  --mediterranean-blue: #157db3;
  --mediterranean-blue-rgb: 21 125 179;
  --mediterranean-blue-oklch: oklch(0.561 0.12 238.9);
}

.element {
  color: var(--mediterranean-blue);
  background-color: hsl(201 79% 39%);
  border-color: oklch(0.561 0.12 238.9);
}

Tailwind CSS v4

@theme {
  --color-mediterranean-blue: #157db3;
  --color-mediterranean-blue-50: #d8faff;
  --color-mediterranean-blue-100: #c5eeff;
  --color-mediterranean-blue-200: #a6dcff;
  --color-mediterranean-blue-300: #7dc0ef;
  --color-mediterranean-blue-400: #52a8dd;
  --color-mediterranean-blue-500: #1b8fcc;
  --color-mediterranean-blue-600: #1c79ac;
  --color-mediterranean-blue-700: #16618a;
  --color-mediterranean-blue-800: #094866;
  --color-mediterranean-blue-900: #063248;
  --color-mediterranean-blue-950: #001d2f;
}

SCSS

$mediterranean-blue: #157db3;
$mediterranean-blue-rgb: 21, 125, 179;
$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);
}