change top margin of second page using mPDF

I'm dynamically generating PDFs with an unknown page count. mPDF is working good, but the top margin on the second page is gone. How can I set the margins for all pages with the document?

I've tried the following, but it has no effect:

$mpdf = new mPDF('', '', 0, '', 15, 15, 15, 15, 8, 8);

Solution

I was able to find an answer. Here it is in case anyone needs it:

define the margins using @page like:

@page *{
    margin-top: 2.54cm;
    margin-bottom: 2.54cm;
    margin-left: 3.175cm;
    margin-right: 3.175cm;
}
</style>';

Reference: http://www.mpdf1.com/forum/discussion/80