Using ConvertPlug with WP Rocket
If you're using the conversion plugin ConvertPlug, you may find that - once WP Rocket is enabled - your forms or pop-up lose their style.
This is due to the fact that ConvertPlug doesn't behave well with Google Fonts Minification.
To fix the issue, you simply have to disable this option:
Settings → WP Rocket → Basic Options → Files Optimisation → Google Fonts
In this way all your forms and pop-up will be displayed just fine!