fonatawesome cdn code example
Example 1: font awesome bootstrap cdn
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
Example 2: font awesome cdn
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">