#right_all
{
    width:721px;
    height:auto;
    margin-left:auto;
    margin-right:auto;
}
#development_top
{
    background-image:url(../images/biaotigongsilicheng.jpg);
    width:721px;
    height:77px;
   
}

#daohang
{
    float:right;
    margin-right:23px;
    margin-top:50px;
    font-family:宋体;
    font-size:14px;
}
#dev_content
{
   margin-left:10px;
   margin-top:30px;
    width:auto;
    height:auto;
}