Comments Not Aligned Correctly

Hi there. I ran into a problem about a month ago. My comments weren’t displaying correctly. After a lot of tinkering and some help from some very friendly forum members my problem was resolved. If you’re interested here’s the thread:

http://wordpress.org/support/topic/leave-a-reply-being-displayed-underneath-sidebar?replies=8#post-4714613

Well, it turns out things weren’t completely resolved. Although my comments are being displayed properly on my pages, I just noticed that my comments are not being displayed correctly on my posts. Here’s an example:

http://www.waterheaterleakinginfo.com/how-to-replace-the-dip-tube/

The way I solved this before was to paste the following code in the “Edit CSS” section under “Appearance”.

#comments {
	width: 967px;
	margin: 0 auto;
	padding: 4px 0;
}

#respond {
	margin: 0 4px;
}

I have no idea how to make adjustments to just my posts without affecting my pages. Anyone have any ideas?