#site_nav_under
{
    display: none;
}
.c_ad_block, .ad_text_commentbox
{
    display: none;
    margin: 0;
    padding: 0;
}
#ad_under_google
{
    height: 0;
    overflow: hidden;
}
#ad_under_google a
{
    display: none;
}
body
{
	background-image: url(https://images.cnblogs.com/cnblogs_com/spactim/1020880/o_timg.jpg);
	background-repeat: no-repeat;
	background-attachment: fixed;
	background-size: 100%;
	background-position: center;
}