#10162E

CSS

:root {
  --dark-knight: #10162e;
  --dark-knight-rgb: 16 22 46;
  --dark-knight-oklch: oklch(0.209 0.048 271.1);
}

.element {
  color: var(--dark-knight);
  background-color: hsl(228 48% 12%);
  border-color: oklch(0.209 0.048 271.1);
}

Tailwind CSS v4

@theme {
  --color-dark-knight: #10162e;
  --color-dark-knight-50: #f0f5ff;
  --color-dark-knight-100: #e2e7f9;
  --color-dark-knight-200: #cdd3ea;
  --color-dark-knight-300: #afb6d1;
  --color-dark-knight-400: #949dbc;
  --color-dark-knight-500: #7a85a7;
  --color-dark-knight-600: #67708d;
  --color-dark-knight-700: #535a71;
  --color-dark-knight-800: #3b4254;
  --color-dark-knight-900: #292d3a;
  --color-dark-knight-950: #171a24;
}

SCSS

$dark-knight: #10162e;
$dark-knight-rgb: 16, 22, 46;
$dark-knight-light: mix(#fff, $dark-knight, 20%);
$dark-knight-dark: mix(#000, $dark-knight, 20%);

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