Extra spacing on top of the main-navigation on mobile view.

I am working on the issue and will create a patch to fix the issue

I have created a patch to address the above issue. I am attaching a screenshot for reference, showing the state before and after applying the patch.
In this patch removed a line of code margin-top: 20px; from custom-style.css file.

@lokeshsahu
Patch is working as accepted.

I have reviewed and implemented the Patch provided by @lokeshsahu.
The Patch has been implemented successfully.
Result:- Resolved extra spacing issue on top of the main navigation on mobile view.
So moving it to RTBC.
I am sharing the before & after state in my screenshot for your reference.
Thank You.

Added background for the header.