#1F70E8

CSS

:root {
  --deep-sky-blue: #1f70e8;
  --deep-sky-blue-rgb: 31 112 232;
  --deep-sky-blue-oklch: oklch(0.568 0.197 259.1);
}

.element {
  color: var(--deep-sky-blue);
  background-color: hsl(216 81% 52%);
  border-color: oklch(0.568 0.197 259.1);
}

Tailwind CSS v4

@theme {
  --color-deep-sky-blue: #1f70e8;
  --color-deep-sky-blue-50: #d6f7ff;
  --color-deep-sky-blue-100: #c3e9ff;
  --color-deep-sky-blue-200: #a4d5ff;
  --color-deep-sky-blue-300: #7cb6ff;
  --color-deep-sky-blue-400: #509bff;
  --color-deep-sky-blue-500: #237eff;
  --color-deep-sky-blue-600: #206bdc;
  --color-deep-sky-blue-700: #1956b1;
  --color-deep-sky-blue-800: #073f85;
  --color-deep-sky-blue-900: #052c5e;
  --color-deep-sky-blue-950: #001840;
}

SCSS

$deep-sky-blue: #1f70e8;
$deep-sky-blue-rgb: 31, 112, 232;
$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);
}