Box shadow is visible over content_bg_edge.png

Hi,
our web is on template Hot Hotel, Joomla 2,5

We need your help about one detail.
When we change color of .copyright_area_wrap and content_bg_edge.png from black to ligh grey, in corner we notice that box-shadow is in front of content_bg_edge.png or that content_bg_edge.png is transparent in that area.
In eny case box-shadow is visible in area where it should not be,

In attach you can find printscreen of this.

Can you help us to work this out.

Thank you.

Yes I see, can you send us link so we could check live

I think you will have to use non-transparent image in this case:

templates/hot_hotel/images/content_bg_edge.png