.c_ad_block,#opt_under_post,#ad_t2,#blog_post_info,#sideBarMain

{
  display:none;
}
#mainContent
{
 width:100%;
}
body
{
 background-image:url(https://ss1.bdstatic.com/lvoZeXSm1A5BphGlnYG/skin/756.jpg); 
background-size: 100% 100%;
  -moz-background-size: 100% 100%;
  -webkit-background-size: 100% 100%;
background-attachment: fixed;
}