.nube{
    margin: 0 auto;
    width: 300px;
    height: 200px;
    border:1px solid #ccc;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    border-radius: 10px;
    behaviour: url(border-radius.htc);
    padding: 5px;
}
.nube a{color:#E9E9E9}