#2570F0

CSS

:root {
  --deep-sky-blue: #2570f0;
  --deep-sky-blue-rgb: 37 112 240;
  --deep-sky-blue-oklch: oklch(0.576 0.206 260.6);
}

.element {
  color: var(--deep-sky-blue);
  background-color: hsl(218 87% 54%);
  border-color: oklch(0.576 0.206 260.6);
}

Tailwind CSS v4

@theme {
  --color-deep-sky-blue: #2570f0;
  --color-deep-sky-blue-50: #d6f6ff;
  --color-deep-sky-blue-100: #c3e8ff;
  --color-deep-sky-blue-200: #a5d4ff;
  --color-deep-sky-blue-300: #7db4ff;
  --color-deep-sky-blue-400: #5299ff;
  --color-deep-sky-blue-500: #277cff;
  --color-deep-sky-blue-600: #2369e1;
  --color-deep-sky-blue-700: #1c54b5;
  --color-deep-sky-blue-800: #093e88;
  --color-deep-sky-blue-900: #062b60;
  --color-deep-sky-blue-950: #001742;
}

SCSS

$deep-sky-blue: #2570f0;
$deep-sky-blue-rgb: 37, 112, 240;
$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);
}