[itext] How to insert blank lines in PDF?

I had to add blank lines after a table and I manage it adding many divs as I need it with a css style with padding-top set it up, like this. I've used a template engine (underscore) to loop through the number of lines I need to add.

 <% var maxRow = 30; var pos = items.models.length; %>
 <% for( pos; pos < maxRow; pos++ ){ %>
       <div class="blankRow"></div>
 <% }; %>

My css file:

 .blankRow:{ padding-top: 15px;}