#186FEA

CSS

:root {
  --deep-sky-blue: #186fea;
  --deep-sky-blue-rgb: 24 111 234;
  --deep-sky-blue-oklch: oklch(0.567 0.202 258.9);
}

.element {
  color: var(--deep-sky-blue);
  background-color: hsl(215 83% 51%);
  border-color: oklch(0.567 0.202 258.9);
}

Tailwind CSS v4

@theme {
  --color-deep-sky-blue: #186fea;
  --color-deep-sky-blue-50: #d5f7ff;
  --color-deep-sky-blue-100: #c2e9ff;
  --color-deep-sky-blue-200: #a3d5ff;
  --color-deep-sky-blue-300: #7ab6ff;
  --color-deep-sky-blue-400: #4d9bff;
  --color-deep-sky-blue-500: #1b7eff;
  --color-deep-sky-blue-600: #1b6bdf;
  --color-deep-sky-blue-700: #1556b3;
  --color-deep-sky-blue-800: #033f86;
  --color-deep-sky-blue-900: #032c5f;
  --color-deep-sky-blue-950: #001841;
}

SCSS

$deep-sky-blue: #186fea;
$deep-sky-blue-rgb: 24, 111, 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);
}