how to set the form center in the body?

Suite and Optimus Suite 5
#1

in my body tag,i set “text-align:center”,and in the div ,i set “margin:0 auto”,but the form is still not in the center ,what can i do it ?

#2

Could you provide us a completed demo?
docs.dhtmlx.com/doku.php?id=othe … leted_demo