#3C76AA

CSS

:root {
  --naval: #3c76aa;
  --naval-rgb: 60 118 170;
  --naval-oklch: oklch(0.55 0.102 247.8);
}

.element {
  color: var(--naval);
  background-color: hsl(208 48% 45%);
  border-color: oklch(0.55 0.102 247.8);
}

Tailwind CSS v4

@theme {
  --color-naval: #3c76aa;
  --color-naval-50: #e0f8ff;
  --color-naval-100: #cfebff;
  --color-naval-200: #b4d8ff;
  --color-naval-300: #90bcea;
  --color-naval-400: #6ca4d8;
  --color-naval-500: #4a8bc6;
  --color-naval-600: #3f76a7;
  --color-naval-700: #325e86;
  --color-naval-800: #214563;
  --color-naval-900: #163046;
  --color-naval-950: #071c2d;
}

SCSS

$naval: #3c76aa;
$naval-rgb: 60, 118, 170;
$naval-light: mix(#fff, $naval, 20%);
$naval-dark: mix(#000, $naval, 20%);

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