Air Blue

CSS

:root {
  --air-blue: #69a3c1;
  --air-blue-rgb: 105 163 193;
  --air-blue-oklch: oklch(0.687 0.075 231.9);
}

.element {
  color: var(--air-blue);
  background-color: hsl(200 42% 58%);
  border-color: oklch(0.687 0.075 231.9);
}

Tailwind CSS v4

@theme {
  --color-air-blue: #69a3c1;
  --color-air-blue-50: #e1f9ff;
  --color-air-blue-100: #d1edfe;
  --color-air-blue-200: #b6daf0;
  --color-air-blue-300: #92bed8;
  --color-air-blue-400: #70a7c3;
  --color-air-blue-500: #4e8faf;
  --color-air-blue-600: #437994;
  --color-air-blue-700: #356177;
  --color-air-blue-800: #254757;
  --color-air-blue-900: #18313d;
  --color-air-blue-950: #091d27;
}

SCSS

$air-blue: #69a3c1;
$air-blue-rgb: 105, 163, 193;
$air-blue-light: mix(#fff, $air-blue, 20%);
$air-blue-dark: mix(#000, $air-blue, 20%);

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