font-awsome 4 icons code example
Example 1: font awesome icons
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
Example 2: fontawesome 4.7 icon
<i class="fa fa-facebook" aria-hidden="true"></i>
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
<i class="fa fa-facebook" aria-hidden="true"></i>