#42A7BD

CSS

:root {
  --true-sky-blue: #42a7bd;
  --true-sky-blue-rgb: 66 167 189;
  --true-sky-blue-oklch: oklch(0.679 0.097 214.7);
}

.element {
  color: var(--true-sky-blue);
  background-color: hsl(191 48% 50%);
  border-color: oklch(0.679 0.097 214.7);
}

Tailwind CSS v4

@theme {
  --color-true-sky-blue: #42a7bd;
  --color-true-sky-blue-50: #d7fdff;
  --color-true-sky-blue-100: #c4f1fd;
  --color-true-sky-blue-200: #a5dfef;
  --color-true-sky-blue-300: #7bc4d8;
  --color-true-sky-blue-400: #50adc2;
  --color-true-sky-blue-500: #0f96ae;
  --color-true-sky-blue-600: #147f93;
  --color-true-sky-blue-700: #126676;
  --color-true-sky-blue-800: #084b56;
  --color-true-sky-blue-900: #06343c;
  --color-true-sky-blue-950: #001f26;
}

SCSS

$true-sky-blue: #42a7bd;
$true-sky-blue-rgb: 66, 167, 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);
}