1. To adjust the height of your navbar, I took a blank navbar template and did this:
HTML Code:
<!-- nav buttons bar -->
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="0" border="0" width="100%" height="25px" align="center" style="border-top-width:0px">
<tr align="center">
I added "height="25px" after the width tag and that worked.
As for the border around your navbar that is under the Main CSS.
2. Go to the Main CSS link in the dropdown menu of that skin and find the Popup Menu Control box. In Extra CSS Attributes on the right hand side you might see a tag for a border. Delete it.
3. You would go about the same way to add a page border. Just scroll to the top and add the same border tag under the "body" options in Extra CSS Attributes or the page background.
There you go