Part of the html for that page looks like this:
Code:
<table border="0" width="95%" cellpadding="0" cellspacing="0" align="center">
<tr>
<td width="95%" class="logo_bg">
<table width="95%" border="0" cellpadding="0" cellspacing="0">
<tr>
If you change the 95% in red to 100%, I think that will fix it. (Sorry, I don't know exactly where you need to change it - or whether it's in a template or stylevar).