Why font awesome icon shows empty squares?
问题 I would like to make a combination of icons via FA stack but it does not work. I have pure example from documentation and it shows me only empty squares. Code looks like: <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"> <span class="fa-stack" style="vertical-align: top;"> <i class="far fa-circle fa-stack-2x"></i> <i class="fas fa-flag fa-stack-1x"></i> </span> and the result looks like on the picture below (last icon on the line). What