Splash page issue

Hi I have issue with my splash page ( Cloud). How can i fix this problem.

When mobile phone connect to guest portal the screen not full

Software Version
3.11.3-r7

l

Tks for watching.

Can you try with multiple client and observe the behaviour. 

What is the client model where this issue is seen? 

Regards

Anand 

All client is the same issue (iphone and samsung,..). It's not full the screen. When I move it to cnmaestro on premise it's OK. But i need config with cloud

Tks