#244558

CSS

:root {
  --capital-blue: #244558;
  --capital-blue-rgb: 36 69 88;
  --capital-blue-oklch: oklch(0.374 0.051 235.6);
}

.element {
  color: var(--capital-blue);
  background-color: hsl(202 42% 24%);
  border-color: oklch(0.374 0.051 235.6);
}

Tailwind CSS v4

@theme {
  --color-capital-blue: #244558;
  --color-capital-blue-50: #e8f8ff;
  --color-capital-blue-100: #d9ebf7;
  --color-capital-blue-200: #c1d8e8;
  --color-capital-blue-300: #a0bccf;
  --color-capital-blue-400: #82a4b9;
  --color-capital-blue-500: #658ca3;
  --color-capital-blue-600: #56768a;
  --color-capital-blue-700: #455f6f;
  --color-capital-blue-800: #314651;
  --color-capital-blue-900: #213039;
  --color-capital-blue-950: #101c23;
}

SCSS

$capital-blue: #244558;
$capital-blue-rgb: 36, 69, 88;
$capital-blue-light: mix(#fff, $capital-blue, 20%);
$capital-blue-dark: mix(#000, $capital-blue, 20%);

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