Blue Expanse

CSS

:root {
  --blue-expanse: #253f74;
  --blue-expanse-rgb: 37 63 116;
  --blue-expanse-oklch: oklch(0.376 0.096 262.9);
}

.element {
  color: var(--blue-expanse);
  background-color: hsl(220 52% 30%);
  border-color: oklch(0.376 0.096 262.9);
}

Tailwind CSS v4

@theme {
  --color-blue-expanse: #253f74;
  --color-blue-expanse-50: #e8f5ff;
  --color-blue-expanse-100: #d8e8ff;
  --color-blue-expanse-200: #c0d4ff;
  --color-blue-expanse-300: #9fb7ea;
  --color-blue-expanse-400: #809ed8;
  --color-blue-expanse-500: #6485c6;
  --color-blue-expanse-600: #5571a7;
  --color-blue-expanse-700: #445a86;
  --color-blue-expanse-800: #2f4264;
  --color-blue-expanse-900: #202e46;
  --color-blue-expanse-950: #0f1a2e;
}

SCSS

$blue-expanse: #253f74;
$blue-expanse-rgb: 37, 63, 116;
$blue-expanse-light: mix(#fff, $blue-expanse, 20%);
$blue-expanse-dark: mix(#000, $blue-expanse, 20%);

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