How to make the drop down menu wider?

I am adding subpages under my main pages, and some of the words are getting cut off because the drop down navigation is not wide enough. Can someone that knows Wordpress and CSS tell me what code I need to edit in order to widen the drop-down menu? Any help would be greatly appreciated...

 

provide ur website address

 

The website is lawnmowerreviewsandmore.com

 

style.css (line 409)

.artmenu ul {
background-image:url("images/spacer.gif");
margin:-10px 0 0 -30px;
padding:10px 30px 30px;
}

Code (markup):

remove margin and padding

.artmenu ul {
background-image:url("images/spacer.gif");
}

Code (markup):

 

That did the trick. Thank you so much for the help