A method for easily stacking multiple icons. Use the icon-stack class on the parent and
icon-stack-base for the bottom icon.
icon-twitter on icon-check-empty
icon-flag on icon-circle
icon-terminal on icon-sign-blank
icon-camera on icon-ban-circle
{% highlight html %}
icon-twitter on icon-check-empty
icon-flag on icon-circle
icon-terminal on icon-sign-blank
icon-camera on icon-ban-circle
{% endhighlight %}