Background Issue

Hey ^^ :

I have recently Tried To add a background to my style as barriers , it consists of 2 bars and this is its link http://www11.0zz0.com/2015/04/21/16/877356629.png

My Forum Link is : WWW.Yukajo.com

and the issue is how to add this 2 Bars Back ground to my forum

although i tried to add them in the background area in the Style

Hi,

You can stretch and apply backgrounds via CSS.
Display > Colors > CSS stylesheet

Code:

body {
  background:url(http://www11.0zz0.com/2015/04/21/16/877356629.png) fixed no-repeat 0 0 #000;
  background-size:100% 100%;
}