How to change dropdown position in Main Menu?

I’m trying the following solution and works..

Before the tag ‘</head>’ in the ‘header.php’ file, i’ve added the following css code:

<style type=”text/css” media=”screen”>
#primary-nav ul.sub-menu { margin-top:-140px; }
</style>

where the 140px height it’s enough for a height of 3 subitems, one in double-size.