Navigation bar color bug

[Nándii]

I need a coding expert's help.  
I want to give my navigation bar a different color than the header has, and there's an option built in shopify for that reason. It's the mun color scheme option. However, it doesn't work for me. When I try to change its color nothing happens, and the navigation bar's color changes with the color scheme option which should only adjust the header's color.
I was told by the support that it's a coding bug due to my previous codings.
Any idea?

[AnneLuo]

Hi , @Nándii 

Can you share the store URL and take a screenshot to describe your requirements? So that I can assist you.

[Nándii]

Here's my url:
https://admin.shopify.com/store/a9765e-c1/themes/163943285073/editor?category=gid%3A%2F%2Fshopify%2F...
 
So right now the navigation bar has the same color than the header has:

And I want it to be like this:

 The black color would be nice as in the image.

[AnneLuo]

Hi. Got it. But the URL you provided is for admin, not the store.

[Nándii]

Oh sorry, there was an issue with my domain.
Here is it: https://a9765e-c1.myshopify.com/

[AnneLuo]

And password please.

[Nándii]

Password: Money

[Nándii]

 Money

[AnneLuo]

I can help you with it. It involves a lot of code modifications. So I need to access your store as a collaborator if possible. 

[Nándii]

Of course, here's the Collaborator Request Code: 8066

[AnneLuo]

I have applied. Please confirm.

[Nándii]

You're confirmed