#414F6D

CSS

:root {
  --naval-blue: #414f6d;
  --naval-blue-rgb: 65 79 109;
  --naval-blue-oklch: oklch(0.429 0.053 264.9);
}

.element {
  color: var(--naval-blue);
  background-color: hsl(221 25% 34%);
  border-color: oklch(0.429 0.053 264.9);
}

Tailwind CSS v4

@theme {
  --color-naval-blue: #414f6d;
  --color-naval-blue-50: #eef5ff;
  --color-naval-blue-100: #e0e8fa;
  --color-naval-blue-200: #cad4ec;
  --color-naval-blue-300: #abb7d4;
  --color-naval-blue-400: #8f9fbf;
  --color-naval-blue-500: #7586aa;
  --color-naval-blue-600: #637190;
  --color-naval-blue-700: #4f5b73;
  --color-naval-blue-800: #394355;
  --color-naval-blue-900: #272e3b;
  --color-naval-blue-950: #151b25;
}

SCSS

$naval-blue: #414f6d;
$naval-blue-rgb: 65, 79, 109;
$naval-blue-light: mix(#fff, $naval-blue, 20%);
$naval-blue-dark: mix(#000, $naval-blue, 20%);

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