#3AA8BD

CSS

:root {
  --true-sky-blue: #3aa8bd;
  --true-sky-blue-rgb: 58 168 189;
  --true-sky-blue-oklch: oklch(0.679 0.101 212.9);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(190 53% 48%);
  border-color: oklch(0.679 0.101 212.9);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #3aa8bd;
  --color-true-sky-blue-50: #d5fdff;
  --color-true-sky-blue-100: #c2f1fd;
  --color-true-sky-blue-200: #a2e0ef;
  --color-true-sky-blue-300: #77c5d8;
  --color-true-sky-blue-400: #4aaec2;
  --color-true-sky-blue-500: #0097ae;
  --color-true-sky-blue-600: #008093;
  --color-true-sky-blue-700: #046676;
  --color-true-sky-blue-800: #004b56;
  --color-true-sky-blue-900: #02343c;
  --color-true-sky-blue-950: #002026;
}

SCSS

$true-sky-blue: #3aa8bd;
$true-sky-blue-rgb: 58, 168, 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);
}