#ABC4F4

CSS

:root {
  --sky-high: #abc4f4;
  --sky-high-rgb: 171 196 244;
  --sky-high-oklch: oklch(0.818 0.073 263.3);
}

.element {
  color: var(--sky-high);
  background-color: hsl(219 77% 81%);
  border-color: oklch(0.818 0.073 263.3);
}

Tailwind CSS v4

@theme {
  --color-sky-high: #abc4f4;
  --color-sky-high-50: #ebf5ff;
  --color-sky-high-100: #dce8ff;
  --color-sky-high-200: #c5d4f5;
  --color-sky-high-300: #a5b7de;
  --color-sky-high-400: #889fcb;
  --color-sky-high-500: #6d86b7;
  --color-sky-high-600: #5c719b;
  --color-sky-high-700: #4a5b7c;
  --color-sky-high-800: #34435c;
  --color-sky-high-900: #232e40;
  --color-sky-high-950: #121b29;
}

SCSS

$sky-high: #abc4f4;
$sky-high-rgb: 171, 196, 244;
$sky-high-light: mix(#fff, $sky-high, 20%);
$sky-high-dark: mix(#000, $sky-high, 20%);

.element {
  color: $sky-high;
  box-shadow: 0 0 0 2px rgba($sky-high, 0.35);
}