#3BA8BA

CSS

:root {
  --true-sky-blue: #3ba8ba;
  --true-sky-blue-rgb: 59 168 186;
  --true-sky-blue-oklch: oklch(0.678 0.1 210.6);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(189 52% 48%);
  border-color: oklch(0.678 0.1 210.6);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #3ba8ba;
  --color-true-sky-blue-50: #d6fdff;
  --color-true-sky-blue-100: #c3f1fc;
  --color-true-sky-blue-200: #a3e0ee;
  --color-true-sky-blue-300: #78c5d6;
  --color-true-sky-blue-400: #4baebf;
  --color-true-sky-blue-500: #0097ab;
  --color-true-sky-blue-600: #038090;
  --color-true-sky-blue-700: #066674;
  --color-true-sky-blue-800: #014c55;
  --color-true-sky-blue-900: #03353b;
  --color-true-sky-blue-950: #002025;
}

SCSS

$true-sky-blue: #3ba8ba;
$true-sky-blue-rgb: 59, 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);
}