How to make flexmonster works inside an iFrame?

Hello, Daniel!

Thank you for reaching out to us.
Kindly note that loading Flexmonster in an IFrame is not recommended. If possible, please avoid using IFrame and use the <div> container; this will work properly. Our representatives will contact you via email soon with more details about that issue. 
Feel free to contact us if more questions arise.

Best Regards,
Maksym