#4CA7BA

CSS

:root {
  --true-sky-blue: #4ca7ba;
  --true-sky-blue-rgb: 76 167 186;
  --true-sky-blue-oklch: oklch(0.681 0.09 213.4);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(190 44% 51%);
  border-color: oklch(0.681 0.09 213.4);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #4ca7ba;
  --color-true-sky-blue-50: #d9fcff;
  --color-true-sky-blue-100: #c7f0fb;
  --color-true-sky-blue-200: #a9dfed;
  --color-true-sky-blue-300: #80c4d5;
  --color-true-sky-blue-400: #58acbf;
  --color-true-sky-blue-500: #2695aa;
  --color-true-sky-blue-600: #237e90;
  --color-true-sky-blue-700: #1d6573;
  --color-true-sky-blue-800: #114b54;
  --color-true-sky-blue-900: #0b343b;
  --color-true-sky-blue-950: #001f25;
}

SCSS

$true-sky-blue: #4ca7ba;
$true-sky-blue-rgb: 76, 167, 186;
$true-sky-blue-light: mix(#fff, $true-sky-blue, 20%);
$true-sky-blue-dark: mix(#000, $true-sky-blue, 20%);

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