Hello,

Thank you very much for choosing our theme and for contacting us.

As for the arrows:

Please add this code to the Theme Settings > Custom CSS > Global:

body .basel-products-tabs .owl-carousel .owl-nav div:before {
    font-weight: 900;
    width: 50px;
    font-size: 30px;
    height: 85px;
    line-height: 85px;
	  color:red;
}
body .basel-products-tabs .owl-carousel .owl-nav {
	top: -97px;
}

You can change the values as per your needs.

As for the banners, chose “Middle” in the content alignment and wrap this sentence in a div

Best Regards