I been trying to make a transparent background in the modules of J51_Enlighten template... lookin in the forum i found this:
#container_slideshow,
#container_top1_modules,
.container_top2_modules,
#container_top3_modules, #container_main,
#container_bottom1_modules,
#container_bottom2_modules, #container_base,
#container_copyright,
#container_footermenu {
background-color: transparent !important;
}

But is not working... the top module still display a white back

I know you got the right answer for this