Some quick banner customisation :
Removing extra vertical spaces from banner
.banner { padding: 10px 0; }
Semi-transparent banner
.banner { background: rgba(255,255,255,0.7)!important; }
Adding a shadow to the banner
.banner { box-shadow: 1px 1px 10px rgba(0,0,0,0.2); }
Sticky banner
.banner { position: fixed; width: 100%; left: 0; top: 0; z-index: 9999; box-shadow: 1px 1px 5px rgba(0,0,0,0.09); }
For a smoother sticky banner, please see this article :
Sticky Banner