User blog comment:Seth4564official/Infobox help/@comment-5431054-20130613023600

I hate to break it to you, but infoboxes aren't meant to fit the whole screen, but you can change width:300px to whatever width you want(e.g. width:650px. To change the color, change background-color:#3366CC to whatever color you want, (example background-color:red)