#41709A

CSS

:root {
  --naval: #41709a;
  --naval-rgb: 65 112 154;
  --naval-oklch: oklch(0.53 0.084 247.1);
}

.element {
  color: var(--naval);
  background-color: hsl(208 41% 43%);
  border-color: oklch(0.53 0.084 247.1);
}

Tailwind CSS v4

@theme {
  --color-naval: #41709a;
  --color-naval-50: #e3f8ff;
  --color-naval-100: #d3ebff;
  --color-naval-200: #b9d8f7;
  --color-naval-300: #96bce1;
  --color-naval-400: #75a3ce;
  --color-naval-500: #568bbb;
  --color-naval-600: #49769e;
  --color-naval-700: #3a5e7f;
  --color-naval-800: #28455e;
  --color-naval-900: #1b3042;
  --color-naval-950: #0b1c2a;
}

SCSS

$naval: #41709a;
$naval-rgb: 65, 112, 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);
}