Hello
To amend try adding the following to the Custom CSS field of your templates parameters...
#container_top1_modules, #container_top2_modules,
#container_top3_modules, #container_main,
#container_bottom1_modules, #container_bottom2_modules,
#container_bottom3_modules, #container_base,
#container_copyright {
margin-left: 0;
margin-right: 0;
}
#container_slideshow {
padding: 0 !important;
}
CiarĂ¡n