.pic_list{ _position:relative; _zoom:1}
ul.pic_list li{width:20%; margin:20px 0 20px 0; height:auto}
ul.pic_list li .img_Box{ margin:0 auto;width: 150px; height: 150px;}
ul.pic_list li img{width: 150px; height: 150px;}
@media only screen and (max-width:768px){
ul.pic_list li .img_Box{ width:90%; height:90%}
ul.pic_list li img{width:100%; height:100%;}
}
@media only screen and (max-width:515px){
ul.pic_list li{width:50%; margin:20px 0 0px 0; height:auto}
}