[Theme: Sketch] Using logo in header makes menu go behind slider

Hi there,

I’m a relative newbie to the blogging world and don’t have much coding experience.

I’ve recently started using Sketch theme on https://www.theglobalcouple.com.

One of the features of this theme is the ability to put a small logo to the left of the site title, which is what I would like to do. However, every time I put the logo there the drop down menu displays BEHIND the image slider (Metaslider plugin). When I don’t have the logo there, the menu displays as it should, in front of the slider.

I wonder if anyone can tell me if there is some code that I need to insert somewhere to stop this happening? I would really like to get my logo up there so it doesn’t look so plain.

I have looked up the theme documentation and cannot find a solution there.

Thanks in advance for your help!

Petra