Admin Forum:Moving Text Box

How do I make a box of text to only fill like 75% of the page? This problem started when Wikia put a second add on my wiki's homepage, which I find unfair because I'm wiki doesn't even get any viewers in the first place! The add was placed in front of the box, and it really made it ugly. I have no idea how to make the box so it only appears BESIDE the add. This is my current code for the box of text:

 Welcome to the Mech Mice Fanon Wiki!

The Mech Mice Fanon Wiki is all about fictional and canon characters/items/locations about the soon-to-come game: Mech Mice! You can create a new page, or edit one of the Special:Allpages we have here. If you need help for what to do on this site, please contact one of the admins here. We hope you enjoy being here!

This is what my wiki's mainpage looks like right now:



Can someone please help me? (Note: I'm talking about the white box on the top of the mainpage.)

-- ''' User:Feey1 I am FEEY1. Speak to me! ''' 03:58, September 22, 2012 (UTC)


 * Hi, the problem is that your wiki's main page does not follow the recommended format specified by Help:Main page column tags (<< read this help page). Please make sure that


 * is the very first thing at the top of your page. Everything on your main page needs to either be in the left column, in the right column, or below both columns. You cannot have content stretching across both columns at the top of the page, otherwise the top right box ad will collide with it. If you put your <div inside the left column, it will solve the problem of the ad overlapping with it.