Please take the advices you have in the discussion above.
Anyway, for the border you don't want.
And The following is portion of the page source from your site.
HTML Code:
<tr>
<!-- All HEADER_ definitions in the columns below are defined in includes/languages/english.php //-->
<td width='1000' valign='middle' height='109'>
<a href='http://YOUR_SITE_ADDRESS/store/index.php?main_page=index'>
<img width='1000' height='109' title=' YOUR Company [home link] ' alt='YOUR Company [home link]' src='includes/templates/classic/images/gckctop.jpg' />
</a>
</td>
<td valign='top' align='center'>
<h1>
</h1>
</td>
</tr>
Please note in above, the table cell and tag of:
HTML Code:
<td valign='top' align='center'>
<h1>
</h1>
</td>
They still occupy space although don't have text in it.
You should remove the tag of
<h1></h1> and/or the text from your file.
And the file should be located in you override directory:-
includes/languages/english/YOUR_TEMPLATE/header.php
around line 21 - 25 in the original file
Another problem, it look like that you are using the classic template directly. And it is not a good practice.
Please read the docs about how to use the override for template and files.
.