.roundabout {
   list-style: none;
   padding: 0;
   margin: 20px auto;
   width:790px;
   height:250px;
}
.roundabout li {
   width:400px;
   height:250px;
   border: 3px solid #fff;
   -moz-border-radius:2px;
   border-radius:2px;
   box-shadow:0px 1px 2px rgba(0,0,0,.15);
   cursor: pointer;
}
.roundabout li img {
    width:100% !important;
}