Dialog tacos problem the bgcolor is not spread over the page

Hi, I am having a problem with using tacos dialog here is my dialog code The problem is that my page is long so has a scroller and when this tacos dialog is shown up then the background gets dimmed but the user can scroll down the page and can see that the lower portion of the page is not

Dialog tacos problem the bgcolor is not spread over the page

Hi, I am having a problem with using tacos dialog here is my dialog code The problem is that my page is long so has a scroller and when this tacos dialog is shown up then the background gets dimmed but the user can scroll down the page and can see that the lower portion of the page is n