#2272EA

CSS

:root {
  --deep-sky-blue: #2272ea;
  --deep-sky-blue-rgb: 34 114 234;
  --deep-sky-blue-oklch: oklch(0.575 0.197 259.2);
}

.element {
  color: var(--deep-sky-blue);
  background-color: hsl(216 83% 53%);
  border-color: oklch(0.575 0.197 259.2);
}

Tailwind CSS v4

@theme {
  --color-deep-sky-blue: #2272ea;
  --color-deep-sky-blue-50: #d6f7ff;
  --color-deep-sky-blue-100: #c3e9ff;
  --color-deep-sky-blue-200: #a4d5ff;
  --color-deep-sky-blue-300: #7db6ff;
  --color-deep-sky-blue-400: #519bff;
  --color-deep-sky-blue-500: #237eff;
  --color-deep-sky-blue-600: #216bdc;
  --color-deep-sky-blue-700: #1a56b1;
  --color-deep-sky-blue-800: #073f84;
  --color-deep-sky-blue-900: #052c5e;
  --color-deep-sky-blue-950: #001840;
}

SCSS

$deep-sky-blue: #2272ea;
$deep-sky-blue-rgb: 34, 114, 234;
$deep-sky-blue-light: mix(#fff, $deep-sky-blue, 20%);
$deep-sky-blue-dark: mix(#000, $deep-sky-blue, 20%);

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