Slide Down Mobile Menu

I have a question concerning the mobile slide options.

Slide Right and Slide Left is pushing the Content to the side even if I set the position to fixed top.
I want to have the same effect on Open Sliding but here it is overlaying the content and not pushing it down when I use fixed top position.

Any help or tip appreciated.

Thanks in advance,
peter

Hi
Please give me your url to check
CEd