Make my forum board bigger?

Hello guys, do you know how I can make my forum board bigger?


Here is around the place I want it to be.  http://prntscr.com/509e6d


PLEASE HELP ME EXPAND MY FORUM BOARD!


-Luke

acp>display>pictures&colors>colors>css tab

you should see

Code:

.pun {
  
    min-width: 768px;

}

change the 768 until you get the width you desire