Provide additional information and request user input.

The Dialog Box gives extra data and demand client input. The Dialog Box is thought to be a transitory window an application makes to recover client input. An application regularly utilizes exchange boxes to incite the client for extra data for menu things. An exchange box for the most part contains at least one controls with which the client enters content, picks alternatives, or coordinates the activity.

What program are you using? what os?

Well, this code would box the whole body of an html document. by using the relative value for position, you are telling it to position relative to its normal position, which the top left corner is at (0,0). by using left: 50px, you are telling the box to set the left margin  edge to 50px and by using top: 50px, you are telling it to set the top margin edge to 50px. by doing this shifting, the top left corner of the box, which is at (0,0) would be positioned at (50,50)