     <style>
                                    .pu-top{}
                                    .pu-top ul{
                                        padding: 0;
                                        margin: 0;}
                                    .pu-top ul li{
                                        font-size: 42px;
                                        color: #000;
                                        margin-right: 55px;                                        
                                        float: left;
                                        padding-bottom: 15px;
                                        cursor: pointer;
                                        font-family: 'constan';}
                                    .pu-top ul li:hover,.pu-top ul li.active{
                                        border-bottom: 3px solid #333;}
                                    
                                    .pu-con{
                                        padding-top: 50px;}
                                    
                                    .pu-one ul{
                                        padding: 0;
                                        margin: 0;}
                                        
                                    .pu-one .p-ul1 ul{
                                        margin-left: 0;}
                                    .pu-one ul li{
                                        margin-bottom: 30px;
                                        position: relative;}
                                    .pu-one ul li a{
                                        display: inline-block;
                                        position:relative;}
                                    .pu-one ul li img{
                                        box-shadow: 0px 1px 5px 3px #c0c0c0;width:275px;}
                                    .pu-one ul li .li-tt{
                                        position: absolute;
                                        left: 0px;
                                        bottom: 0px;
                                        width: 100%;
                                        height: 100%;
                                        background: linear-gradient(to bottom,#fff,#7597ea,#083090);
                                        opacity: 0.75;
                                        display: none;}
                                    .pu-one ul li .li-tt span{
                                        position: absolute;
                                        left: 0px;
                                        padding: 0 10px;
                                        bottom: 15px;
                                        font-size: 16px;
                                        color: #fff;
                                        width: 100%;
                                        font-family: 'constan';}
                                    .pu-one ul li:hover .li-tt{
                                        display: block;}
                                    
                                    
                                    
                                    
                                @media (max-width: 1200px) {
                                    .pu-top ul li{
                                        font-size: 32px;
                                        margin-right: 40px;}
                                    .pu-con{
                                        padding-top: 30px;}
                                }   
                                
                                  @media (max-width: 991px) {
                                    .pu-top ul li{
                                        font-size: 22px;
                                        padding-bottom:10px;
                                        margin-right: 30px;}                                 
                                    
                                }       
                                 
                               @media (max-width:767px) {
                                    .pu-top ul li{
                                        font-size: 18px;
                                        padding-bottom: 5px;
                                        margin-right: 20px;}
                                    
                                    
                                    
                                    
                                    
                                    
                                }           
                                    