body { margin: 0; font-family: Arial, Helvetica, sans-serif; ; background-image: url(cityscape.jpg)} .topnav { overflow: 
hidden; background-color: yellow; } .topnav a { float: center; color: blue; text-align: 
center; padding: 14px 16px; text-decoration: none; font-size: 17px; } .topnav 
a:hover { background-color: red; color: yellow; } .topnav a.active { background-color: 
blue; color: white; }