#99CADE

CSS

:root {
  --sky-fall: #99cade;
  --sky-fall-rgb: 153 202 222;
  --sky-fall-oklch: oklch(0.811 0.058 225);
}

.element {
  color: var(--sky-fall);
  background-color: hsl(197 51% 74%);
  border-color: oklch(0.811 0.058 225);
}

Tailwind CSS v4

@theme {
  --color-sky-fall: #99cade;
  --color-sky-fall-50: #e5f9ff;
  --color-sky-fall-100: #d5ecf7;
  --color-sky-fall-200: #bbdae8;
  --color-sky-fall-300: #99becf;
  --color-sky-fall-400: #79a6b9;
  --color-sky-fall-500: #5a8fa3;
  --color-sky-fall-600: #4d798a;
  --color-sky-fall-700: #3d616f;
  --color-sky-fall-800: #2b4751;
  --color-sky-fall-900: #1d3139;
  --color-sky-fall-950: #0d1d23;
}

SCSS

$sky-fall: #99cade;
$sky-fall-rgb: 153, 202, 222;
$sky-fall-light: mix(#fff, $sky-fall, 20%);
$sky-fall-dark: mix(#000, $sky-fall, 20%);

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