#436F9A

CSS

:root {
  --naval: #436f9a;
  --naval-rgb: 67 111 154;
  --naval-oklch: oklch(0.529 0.084 249.2);
}

.element {
  color: var(--naval);
  background-color: hsl(210 39% 43%);
  border-color: oklch(0.529 0.084 249.2);
}

Tailwind CSS v4

@theme {
  --color-naval: #436f9a;
  --color-naval-50: #e4f8ff;
  --color-naval-100: #d4ebff;
  --color-naval-200: #bad8f8;
  --color-naval-300: #98bbe2;
  --color-naval-400: #77a3ce;
  --color-naval-500: #598abc;
  --color-naval-600: #4b759e;
  --color-naval-700: #3c5e7f;
  --color-naval-800: #29455e;
  --color-naval-900: #1c3042;
  --color-naval-950: #0c1c2a;
}

SCSS

$naval: #436f9a;
$naval-rgb: 67, 111, 154;
$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);
}