Dark Midnight Blue

CSS

:root {
  --dark-midnight-blue: #003377;
  --dark-midnight-blue-rgb: 0 51 119;
  --dark-midnight-blue-oklch: oklch(0.338 0.127 258.3);
}

.element {
  color: var(--dark-midnight-blue);
  background-color: hsl(214 100% 23%);
  border-color: oklch(0.338 0.127 258.3);
}

Tailwind CSS v4

@theme {
  --color-dark-midnight-blue: #003377;
  --color-dark-midnight-blue-50: #e1f7ff;
  --color-dark-midnight-blue-100: #d0e9ff;
  --color-dark-midnight-blue-200: #b5d6ff;
  --color-dark-midnight-blue-300: #92b8f9;
  --color-dark-midnight-blue-400: #6f9fe9;
  --color-dark-midnight-blue-500: #4e86d9;
  --color-dark-midnight-blue-600: #4371b7;
  --color-dark-midnight-blue-700: #355b93;
  --color-dark-midnight-blue-800: #23436d;
  --color-dark-midnight-blue-900: #172e4d;
  --color-dark-midnight-blue-950: #081b33;
}

SCSS

$dark-midnight-blue: #003377;
$dark-midnight-blue-rgb: 0, 51, 119;
$dark-midnight-blue-light: mix(#fff, $dark-midnight-blue, 20%);
$dark-midnight-blue-dark: mix(#000, $dark-midnight-blue, 20%);

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