m1

   }  
        .wrap > img{  
            position: absolute;  
            border: 10px solid magenta;  
            box-sizing: border-box;  

            box-shadow: 4px 4px 3px rgba(0,0,0,0.2);  
            -webkit-transform-origin: center 400px;  
            transform-origin:center 400px;  
            -webkit-transition: transform .7s ease;  
            transition: transform .7s ease;/*移动时间为0.7s，速度为慢->快->慢*/  
        }