Sponsors banners at the sides of the website and the website NO mobile friendly

Hello guys, I’m trying to be able to get the result I want.

In short, I would insert small banner sponsors in the right side of the website page.

While in the left I want to insert classic social icons.

Caution, not in the “body”, but just out of the layout.

Now, I tried various plugins, but none seems to work.

I tried to enter everything manually with css and html.. and I did something.
The problem arises when you visit the site with a mobile or lower resolution device, and banners overlap the body and then the content.

I’m using the latest version of wordpress and I’m working locally with XAMPP.

The result that I’m searching for is virtually this:

Click

This website looks in the same way on both PC and on mobile devices (this site is not mobile friendly) and I wish have something like that..
If you need I can post the website’s link.

Could you help me?
Thank you in advance.
PS: Sorry for my bad english.