font awesome for bootstrap code example
Example: font awesome cdn
<!-- HTML FontAwesome CDN Link -->
<link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- HTML FontAwesome CDN Link -->
<link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">