div.vbox {
  float: left;
  height: 40%; width: 50%;
  margin-top: -220px;
}
div.hbox {
  width:60%;  margin-top: 0;
  margin-left:auto; margin-right:auto;
  height: 60%;
  border:1px solid silver;
  background:#F0F0F0;
  overflow:auto;
  text-align:left;
  clear:both;
}

div.hcenter {
  text-align:center;
}