How Can I Change The Black Color Of The Top Banner?

[Tasifama]

 

Prestashop 1.6.1.4

 

How can I change the black color of the top banner?

 

Please see the picture I've posted here for more specific details.

 

Thanks 

 

 

 

 

[maximumal]

locate at header .banner from themes/default-bootstrap/css/global.css can be edited with themes/default-bootstrap/sass/css/global.scss need Sass

 

header .banner {
    background: black;
    max-height: 100%;
}