The icon (three lines) does not appear in the Mobile Menu

[msterna]

Hi!
I'm currently moving my site from Joomla to Wordpress. I use Gantry + Helium Theme everywhere. In Joomla, when I change the window size, the Mobile Menu with an icon appears. In Wordpress, the Mobile Menu appears but the icon (three lines) doesn't appear. It's similar on the iPhone. Is this a bug in Gantry? Or is it just not working for me? I disabled all plugins while testing. But this seems unnecessary, because the Mobile Menu itself works only without an icon. It looks like the problem is somewhere in the css...
Joomla: sp5.szczecin.pl/stara_strona
WP: sp5.szczecin.pl

[pablop76]

Your page is not loading font-awesome
Why are you moving your site to WordPress? Joomla is more suitable for your site.

[msterna]

As for me, Joomla is more convenient and I know it better. However, last year there was a change from 3 > 4. A change from 4 > 5 is already coming. It is starting to tire me out. There is continuity in WP. Of course, many will disagree. Besides. In some time I will not be administering this site. And my successors will be able to handle WP faster than Joomla....

[msterna]

@pablop76 I've fixed it. Problem with SVG font. I switched to WebFont and it works. Thank you very much for your help!