#4C759E

CSS

:root {
  --naval: #4c759e;
  --naval-rgb: 76 117 158;
  --naval-oklch: oklch(0.55 0.079 249.4);
}

.element {
  color: var(--naval);
  background-color: hsl(210 35% 46%);
  border-color: oklch(0.55 0.079 249.4);
}

Tailwind CSS v4

@theme {
  --color-naval: #4c759e;
  --color-naval-50: #e5f7ff;
  --color-naval-100: #d5eaff;
  --color-naval-200: #bcd7f6;
  --color-naval-300: #9abbdf;
  --color-naval-400: #7aa3cc;
  --color-naval-500: #5c8ab9;
  --color-naval-600: #4e759c;
  --color-naval-700: #3e5e7d;
  --color-naval-800: #2b455c;
  --color-naval-900: #1d3041;
  --color-naval-950: #0d1c29;
}

SCSS

$naval: #4c759e;
$naval-rgb: 76, 117, 158;
$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);
}