#wrapper {
  width:1020px;
  margin:30px auto;
  background:rgb(241, 246, 255);
}
.item,iframe {
  background:#fff;
  box-shadow: 0 1px 2px rgba(0,0,0,.1);
  border:none;
  padding:10px;
  width:460px;
  height:260px;
  float:left;
  padding:14px;
  margin-right:20px;
  margin-bottom:20px;
}
#wrapper iframe:first-child{
  width:965px;
  height:538px;
}
.item:hover {
  box-shadow: 0 1px 2px rgba(0,0,0,.3);  
}