#43A8BA

CSS

:root {
  --true-sky-blue: #43a8ba;
  --true-sky-blue-rgb: 67 168 186;
  --true-sky-blue-oklch: oklch(0.68 0.096 211.3);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(189 47% 50%);
  border-color: oklch(0.68 0.096 211.3);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #43a8ba;
  --color-true-sky-blue-50: #d7fdff;
  --color-true-sky-blue-100: #c4f1fb;
  --color-true-sky-blue-200: #a5e0ed;
  --color-true-sky-blue-300: #7bc5d5;
  --color-true-sky-blue-400: #51aebf;
  --color-true-sky-blue-500: #1097aa;
  --color-true-sky-blue-600: #157f90;
  --color-true-sky-blue-700: #126673;
  --color-true-sky-blue-800: #094b54;
  --color-true-sky-blue-900: #06343b;
  --color-true-sky-blue-950: #001f25;
}

SCSS

$true-sky-blue: #43a8ba;
$true-sky-blue-rgb: 67, 168, 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);
}