#B3CFDB

CSS

:root {
  --pale-whale: #b3cfdb;
  --pale-whale-rgb: 179 207 219;
  --pale-whale-oklch: oklch(0.838 0.034 225.5);
}

.element {
  color: var(--pale-whale);
  background-color: hsl(198 36% 78%);
  border-color: oklch(0.838 0.034 225.5);
}

Tailwind CSS v4

@theme {
  --color-pale-whale: #b3cfdb;
  --color-pale-whale-50: #ecf7fd;
  --color-pale-whale-100: #ddeaf1;
  --color-pale-whale-200: #c6d8e0;
  --color-pale-whale-300: #a6bbc5;
  --color-pale-whale-400: #8aa3ae;
  --color-pale-whale-500: #6e8b98;
  --color-pale-whale-600: #5e7680;
  --color-pale-whale-700: #4b5e67;
  --color-pale-whale-800: #36454b;
  --color-pale-whale-900: #253034;
  --color-pale-whale-950: #131c20;
}

SCSS

$pale-whale: #b3cfdb;
$pale-whale-rgb: 179, 207, 219;
$pale-whale-light: mix(#fff, $pale-whale, 20%);
$pale-whale-dark: mix(#000, $pale-whale, 20%);

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