body {
     background-color: rgba(175,200,225,0.3);
}
 img {
     border: 0;
}
 div {
     width: 300px;
     height: 300px;
}
 #content {
     width: 300px;
     height: 336px;
     position:absolute;
     top:0;
     left:0;
     right:0;
     bottom:0;
     margin: auto;
}
 .grid {
     display: block;
     float: left;
     width: 33.3%;
     height: 33.3%;
}