Why this horizontal scroll bar???

For a particular project I would like to use a Template called Andreas09.
http://andreasviklund.com/templates/andreas09/

When you open Index.html (3 columns) it has no Horizontal scroll bar at the bottom.
But if you open 2col.html (2 columns), a Horizontal scroll bar appears at the bottom.

Can not figure out why.....
Is there any way I can get rid of this horizontal scroll bar please?

Go in and change the width of the columns.

Thank you for your answer Train.
By changing the width of the columns didn't work.
But when I changed the length of standart link box it worked.
Thank you.