Black field after updating and deleting logo slider on entire website

After updating a newer version of the logo slider, the logos were no longer displayed in the right place. I tried to adjust this, but it didn’t work. So I removed the slider to try again. After this, a black bar appeared all over the site. I don’t know how to solve this, that’s why I need your help.
The strange thing is that the site works normally on the mobile phone

The page I need help with: [log in to see the link]