#9CCFDF

CSS

:root {
  --over-the-sky: #9ccfdf;
  --over-the-sky-rgb: 156 207 223;
  --over-the-sky-oklch: oklch(0.824 0.057 219.1);
}

.element {
  color: var(--over-the-sky);
  background-color: hsl(194 51% 74%);
  border-color: oklch(0.824 0.057 219.1);
}

Tailwind CSS v4

@theme {
  --color-over-the-sky: #9ccfdf;
  --color-over-the-sky-50: #e4f9ff;
  --color-over-the-sky-100: #d4edf6;
  --color-over-the-sky-200: #badae6;
  --color-over-the-sky-300: #98bfcc;
  --color-over-the-sky-400: #78a7b6;
  --color-over-the-sky-500: #5990a0;
  --color-over-the-sky-600: #4c7987;
  --color-over-the-sky-700: #3c616c;
  --color-over-the-sky-800: #2a474f;
  --color-over-the-sky-900: #1d3137;
  --color-over-the-sky-950: #0c1d22;
}

SCSS

$over-the-sky: #9ccfdf;
$over-the-sky-rgb: 156, 207, 223;
$over-the-sky-light: mix(#fff, $over-the-sky, 20%);
$over-the-sky-dark: mix(#000, $over-the-sky, 20%);

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