.case_conten {
    margin-top:10px;
}
.case_conten ul li{
    float:left;
    width:380px;
    margin-right:50px;
    background:#fff;
    margin-top:40px;
}
.case_conten ul li:hover{
    box-shadow:1px 2px 1px 1px #dddddd ;
}
.case_conten ul li span{
    color:#333;
    font-size:16px;
    line-height:40px;
    text-align:center;
    display:block;
}
.case_conten .last{
    margin-right:0px;
}