I have icon in bootstrap , and I want to make him bigger, change size.
I can do it by font-size, but I want to know how to do it by bootstrap default functionality.
Html

<span class="glyphicon glyphicon-camera"></span>

I dont want method like this

#id.glyphicon-camera{
font-size: 2em;
}

I want method by classes systems, like awesome fonts fa-2x etc...