Move Slidebar

My categories list after going above 10 categories display behind the slide bar and can not be seen

here is the picture: http://i.imgur.com/PdMiOQA.png

I made couple of categories named t, tt, ttt,...for an example. As you can see they display behind the slide bar


My Question is how do I move the slide bar down so these categories can be seen ?


I'm using DiabloFun Theme

Hi!
To fix this you can change padding on the 251 line:

#mainmenu li a {
		text-align:center;
		color:#fff;
		display:block;
		text-decoration:none;
		font-size:13px;
		padding:18px 25px;
	}

or increase the mainmenu-container's height

#mainmenu-container {
		text-align:center;
		height:50px;
		
	}

in the file style.css.