Antarctic Blue

CSS

:root {
  --antarctic-blue: #4b789b;
  --antarctic-blue-rgb: 75 120 155;
  --antarctic-blue-oklch: oklch(0.555 0.074 243.1);
}

.element {
  color: var(--antarctic-blue);
  background-color: hsl(206 35% 45%);
  border-color: oklch(0.555 0.074 243.1);
}

Tailwind CSS v4

@theme {
  --color-antarctic-blue: #4b789b;
  --color-antarctic-blue-50: #e4f8ff;
  --color-antarctic-blue-100: #d4ebff;
  --color-antarctic-blue-200: #bbd8f2;
  --color-antarctic-blue-300: #98bcdb;
  --color-antarctic-blue-400: #78a4c7;
  --color-antarctic-blue-500: #598cb4;
  --color-antarctic-blue-600: #4c7698;
  --color-antarctic-blue-700: #3d5f7a;
  --color-antarctic-blue-800: #2a465a;
  --color-antarctic-blue-900: #1c303f;
  --color-antarctic-blue-950: #0c1c28;
}

SCSS

$antarctic-blue: #4b789b;
$antarctic-blue-rgb: 75, 120, 155;
$antarctic-blue-light: mix(#fff, $antarctic-blue, 20%);
$antarctic-blue-dark: mix(#000, $antarctic-blue, 20%);

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