Website not Functioning – Entered code in wrong area! :(

I entered a very short bit of code to edit the font size of the navigation menu in functions.php (which I now know is wrong) instead of the google fonts settings area.

After doing so, the page refreshed blank, our website leads to a blank page, and I’m unable to login to our wordpress admin site. HELP! Our hosting company isn’t the most helpful, so I will most likely need to do this myself.

I’m logged into cpanel and I would GREATLY appreciate any suggestions/help.