This is a sample modal box that can be created using the powers of CSS3.
You could do a lot of things here like have a pop-up ad that shows when your website loads, or create a login/register form for users.
This is a sample modal windowX
This is a sample modal window that can be created using CSS3 and HTML5.
Modal windows are used, among many others, to display login/register forms; advertisements; or just notifications to the user. They frequently contain critical information, that user must attend in order to return to the page.