When you leave your computer for a short period of time, why should you put your computer into standby mode?

You should put it into standby mood because it saves energy

Putting the computer in standby mode keeps a computers battery longer and it doesn't burn up as much electricity.

What program is this in?

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)