#436FA0

CSS

:root {
  --naval: #436fa0;
  --naval-rgb: 67 111 160;
  --naval-oklch: oklch(0.532 0.092 252.3);
}

.element {
  color: var(--naval);
  background-color: hsl(212 41% 45%);
  border-color: oklch(0.532 0.092 252.3);
}

Tailwind CSS v4

@theme {
  --color-naval: #436fa0;
  --color-naval-50: #e4f7ff;
  --color-naval-100: #d4eaff;
  --color-naval-200: #bad7fc;
  --color-naval-300: #97bae6;
  --color-naval-400: #76a2d4;
  --color-naval-500: #5789c1;
  --color-naval-600: #4b74a3;
  --color-naval-700: #3b5d83;
  --color-naval-800: #294461;
  --color-naval-900: #1b2f44;
  --color-naval-950: #0c1c2c;
}

SCSS

$naval: #436fa0;
$naval-rgb: 67, 111, 160;
$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);
}