Block Banner with full width

[Petar]

Hello prestashop forums. Im new in prestashop and i have a problem that i cannot fix. The main problem is with the top banner of the page isn't full size. In the picture u can see what im talking about. I have read all the the topic https://www.prestashop.com/forums/topic/330123-solved-block-banner-with-full-width/ but this didn't work for me. As u can see in the picture the right side of the banner show's black color. I have added  this code in the global.css and now the baner moved to the left side but the right side is still black. Any suggestions?

.banner .container, header .banner a {max-width:100%!important; width:100%!important;}