#1B70E6

CSS

:root {
  --deep-sky-blue: #1b70e6;
  --deep-sky-blue-rgb: 27 112 230;
  --deep-sky-blue-oklch: oklch(0.566 0.195 258.5);
}

.element {
  color: var(--deep-sky-blue);
  background-color: hsl(215 80% 50%);
  border-color: oklch(0.566 0.195 258.5);
}

Tailwind CSS v4

@theme {
  --color-deep-sky-blue: #1b70e6;
  --color-deep-sky-blue-50: #d5f7ff;
  --color-deep-sky-blue-100: #c3e9ff;
  --color-deep-sky-blue-200: #a4d5ff;
  --color-deep-sky-blue-300: #7cb6ff;
  --color-deep-sky-blue-400: #4f9cff;
  --color-deep-sky-blue-500: #1f7fff;
  --color-deep-sky-blue-600: #1d6cdb;
  --color-deep-sky-blue-700: #1756b0;
  --color-deep-sky-blue-800: #054084;
  --color-deep-sky-blue-900: #042c5d;
  --color-deep-sky-blue-950: #001840;
}

SCSS

$deep-sky-blue: #1b70e6;
$deep-sky-blue-rgb: 27, 112, 230;
$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);
}