Theme Verti

[Felix]

Hi,

I see that you want to use the icons phone and envelope that do not show up.

I uploaded the verti theme online for a quick check:
http://verti.showme.zone/

There are no problems with using phone and envelope with the fontawesome fonts
in the /assets/fonts/ library

Seems to work:
<a href="#" class="icon fa-phone"><span class="label">Phone</span></a>
<a href="#" class="icon fa-envelope"><span class="label">Envelope</span></a>

In case of different versions of fontawesome you can try to add fa or fas
like this:

<a href="#" class="icon fa fa-phone"><span class="label">Phone</span></a>
<a href="#" class="icon fa fa-envelope"><span class="label">Envelope</span></a>

Just let us know how it is going.