Submenu and Mobile Appearance Problem

Hi Support Team,

I'm using Press theme >> https://themes.muffingroup.com/be/press/
Now I have 2 problems.

1. Desktop view problem.
Submenu which is too wide, how to make it narrow?
For live website, please visit this link

image

2. Mobile appearance
Kindly use your mobile and visit this link
You can see that in the head under banner, there is black background appeared. This happened only in post not Home page.
Please tell me how to remove it.

image

Regards.

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