Make MOBILE MENU overlap

Hi all,
Can anyone please help me to make this mobile menu like Gavick Hotel Template mobile menu?
So i need it to be overlapped after clicking mobile menu, NOT to move the content from right to left, like this University mobile menu works.
Thank you all

I’m afraid that modifications such as this require extensive changes to the theme’s code; I do apologize but such large changes are custom work that are beyond the scope of our technical support.