#0072EE

CSS

:root {
  --deep-sky-blue: #0072ee;
  --deep-sky-blue-rgb: 0 114 238;
  --deep-sky-blue-oklch: oklch(0.573 0.206 257.3);
}

.element {
  color: var(--deep-sky-blue);
  background-color: hsl(211 100% 47%);
  border-color: oklch(0.573 0.206 257.3);
}

Tailwind CSS v4

@theme {
  --color-deep-sky-blue: #0072ee;
  --color-deep-sky-blue-50: #d2f7ff;
  --color-deep-sky-blue-100: #bfeaff;
  --color-deep-sky-blue-200: #9fd5ff;
  --color-deep-sky-blue-300: #75b7ff;
  --color-deep-sky-blue-400: #449cff;
  --color-deep-sky-blue-500: #007fff;
  --color-deep-sky-blue-600: #046ce0;
  --color-deep-sky-blue-700: #0656b4;
  --color-deep-sky-blue-800: #004087;
  --color-deep-sky-blue-900: #002c60;
  --color-deep-sky-blue-950: #001842;
}

SCSS

$deep-sky-blue: #0072ee;
$deep-sky-blue-rgb: 0, 114, 238;
$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);
}