Foren / Cotonti / Support / Where is the message.tpl styled?

I have a weird problem with the message.tpl and than specifically the pop-up it generates to confirm for example when you want to delete a page. When you use the nemesis or the symisun-03 themes and you choose to delete a page a pop-up comes in the middle of the screen asking if you are sure you want to do this.
You than choose yes or no.

I am making a new skin reworking all those tpl's and with this one I am stuck and I can not see how to fix it. Instead of a popup I get a screenwide screwed up streched popup at the top of my screen (so it pushes the header down) with a missing yes button and a not working no button.
I have tried using the default (nemesis) message.tpl as well as the symisun-03 message.tpl and although those work when I select those themes in my profile those tpl's do not work if I choose my own custom theme.

What I am wondering mainly is, where is this tpl getting the style from? I checked all css files I could think of and nowhere can I find the classes specified in the tpl. Can anyone shine a light on this? I am really stumped and noticed I started talking to my screen tonight trying to fix it. So..........I am at a dead end

Here is the default nemesis tpl:

<!-- BEGIN: MAIN -->

		<div class="col first">
			<div class="block">
				<h2 class="warning">{MESSAGE_TITLE}</h2>
				<div class="warning">
					{MESSAGE_BODY}
					<!-- BEGIN: MESSAGE_CONFIRM -->
					<table class="inline" style="width:80%">
						<tr>
							<td><a id="confirmYes" href="{MESSAGE_CONFIRM_YES}" class="confirmButton">{PHP.L.Yes}</a></td>
							<td><a id="confirmNo" href="{MESSAGE_CONFIRM_NO}" class="confirmButton">{PHP.L.No}</a></td>
						</tr>
					</table>
					<!-- END: MESSAGE_CONFIRM -->
				</div>
			</div>
		</div>

<!-- END: MAIN -->

The classes I can not find anywhere are "inline" and "confirmButton".
Also the "confirmYes" and the "confirmNo" id's I can not find.

Any help is very much appreciated.