#9ECCDC

CSS

:root {
  --light-blue: #9eccdc;
  --light-blue-rgb: 158 204 220;
  --light-blue-oklch: oklch(0.818 0.053 221.2);
}

.element {
  color: var(--light-blue);
  background-color: hsl(195 47% 74%);
  border-color: oklch(0.818 0.053 221.2);
}

Tailwind CSS v4

@theme {
  --color-light-blue: #9eccdc;
  --color-light-blue-50: #e6f9ff;
  --color-light-blue-100: #d6ecf5;
  --color-light-blue-200: #bddae5;
  --color-light-blue-300: #9bbecb;
  --color-light-blue-400: #7ca6b5;
  --color-light-blue-500: #5d8f9f;
  --color-light-blue-600: #507987;
  --color-light-blue-700: #3f616c;
  --color-light-blue-800: #2d474f;
  --color-light-blue-900: #1e3137;
  --color-light-blue-950: #0e1d22;
}

SCSS

$light-blue: #9eccdc;
$light-blue-rgb: 158, 204, 220;
$light-blue-light: mix(#fff, $light-blue, 20%);
$light-blue-dark: mix(#000, $light-blue, 20%);

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