.d1{
background-color:#fff;
width:100px;
height:100px;
border:1px solid #000;
-moz-border-radius:10px;
-webkit-border-radius:10px;
border-radius:10px;
behavior:url(http://ons.me/wp-content/uploads/2011/02/border-radius/css/border-radius.htc);
}