#009AEE

CSS

:root {
  --out-of-the-blue: #009aee;
  --out-of-the-blue-rgb: 0 154 238;
  --out-of-the-blue-oklch: oklch(0.661 0.163 244.1);
}

.element {
  color: var(--out-of-the-blue);
  background-color: hsl(201 100% 47%);
  border-color: oklch(0.661 0.163 244.1);
}

Tailwind CSS v4

@theme {
  --color-out-of-the-blue: #009aee;
  --color-out-of-the-blue-50: #d0fbff;
  --color-out-of-the-blue-100: #bbeeff;
  --color-out-of-the-blue-200: #99dbff;
  --color-out-of-the-blue-300: #6bbfff;
  --color-out-of-the-blue-400: #31a6f7;
  --color-out-of-the-blue-500: #008de9;
  --color-out-of-the-blue-600: #0077c4;
  --color-out-of-the-blue-700: #005f9e;
  --color-out-of-the-blue-800: #004775;
  --color-out-of-the-blue-900: #003153;
  --color-out-of-the-blue-950: #001d37;
}

SCSS

$out-of-the-blue: #009aee;
$out-of-the-blue-rgb: 0, 154, 238;
$out-of-the-blue-light: mix(#fff, $out-of-the-blue, 20%);
$out-of-the-blue-dark: mix(#000, $out-of-the-blue, 20%);

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