#1AAABD

CSS

:root {
  --true-sky-blue: #1aaabd;
  --true-sky-blue-rgb: 26 170 189;
  --true-sky-blue-oklch: oklch(0.677 0.113 209.3);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(187 76% 42%);
  border-color: oklch(0.677 0.113 209.3);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #1aaabd;
  --color-true-sky-blue-50: #d1ffff;
  --color-true-sky-blue-100: #bdf3fe;
  --color-true-sky-blue-200: #9be2f0;
  --color-true-sky-blue-300: #6cc7d8;
  --color-true-sky-blue-400: #36b0c2;
  --color-true-sky-blue-500: #0099ae;
  --color-true-sky-blue-600: #008293;
  --color-true-sky-blue-700: #006876;
  --color-true-sky-blue-800: #004d56;
  --color-true-sky-blue-900: #00353c;
  --color-true-sky-blue-950: #002026;
}

SCSS

$true-sky-blue: #1aaabd;
$true-sky-blue-rgb: 26, 170, 189;
$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);
}