adding border image

I am trying to add a custom image border to the feature pages background. I want it look like this. I dont want to replace the whole background with custom image.
http://s29.postimg.org/jxuhe0amf/test.jpg

and the footer right above will have the same.http://s27.postimg.org/5cl0guo43/test3.jpg Except it will above the footer.

I have added it in footer.php of the theme but it only goes half way even when i put the width. The footer goes along the full width of the screen.