#39A8C1

CSS

:root {
  --true-sky-blue: #39a8c1;
  --true-sky-blue-rgb: 57 168 193;
  --true-sky-blue-oklch: oklch(0.68 0.104 216);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(191 54% 49%);
  border-color: oklch(0.68 0.104 216);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #39a8c1;
  --color-true-sky-blue-50: #d5fdff;
  --color-true-sky-blue-100: #c2f1ff;
  --color-true-sky-blue-200: #a2e0f2;
  --color-true-sky-blue-300: #77c5db;
  --color-true-sky-blue-400: #49aec5;
  --color-true-sky-blue-500: #0096b2;
  --color-true-sky-blue-600: #007f96;
  --color-true-sky-blue-700: #026678;
  --color-true-sky-blue-800: #004b58;
  --color-true-sky-blue-900: #01343e;
  --color-true-sky-blue-950: #001f27;
}

SCSS

$true-sky-blue: #39a8c1;
$true-sky-blue-rgb: 57, 168, 193;
$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);
}