I'm using the https://github.com/DevFactoryCH/minify package for minify the css and js files. but I'm getting issue with it when I compile my css files then minify remove the var() properties. this is my code with css variables

:root {
  --primary-color: #1d85b9;
  }
.info.icon-info {
  background: #fff;
  color: var(--primary-color)!important;
}

this is home.blade.php file code

{!! inline_css(Minify::stylesheet(array(
  '/css/bootstrap.css',
  '/css/style.css',
  '/css/label.css',
))) !!}

its compile without var() properties Output:

.info.icon-info {
      background: #fff;
}

Please suggest the alternate minify package for that