Man oh man I don't like that skin anymore! Why oh why a skin would have a body width of 70% then need horizontal scroll bars is beyond me. That's fixable (and I did while trying to figure out your issue) but it was more complex than I feel like doing for a new skin. Here's a fix, but it only addresses the pushed-down sidebar (not the pointless horizontal scroll bar), and I have no idea if it will work in lower resolution or when people use the browser side-bar thingies. In your css file (clean.css in my zip) find the part that says

input.bComment, 
textarea.bComment
{
	background-color: #fff;
	border-width: 1px;
	border-color: #cccccc;
	border-style: solid;
	padding: .5ex;
	width: 98%;
	margin: 0ex;
}

and change the width to 80%. I did not try anything other than 80% so you might be good with 82% if you want to split hairs. Let me rephrase that: I did not try anything *that worked* other than... And come to think of it I doubt 82% would work because something tells me the other side of that stuff is given 18% and there's like a whole bunch of pixels dedicated to padding and margarining in that area.

Actually the horizontal scroll bar isn't all that tough a deal to correct. Same file up top in the body definition on the line that begins with "width: 70%" you have margin-right and margin-left at 15% each. Change them to "margin-right: auto" and "margin-left: 14%". I changed the order to have left first but I don't know if that matters or not within any given definition.