HV Elite iframe doesn't scroll down in mobile safari

I’m using a calander that provides the visitors with a view of the available dates in our holiday home in France.

The code is provided by a website that has more than 2000 ads.

The calender is displayed normal on laptop or Macbook but not with on Ipad and Iphone.

I have used the HTML page in RW.

The code is as follows:

Can somebody help me with this? Thanks in advance.