body {
  background-color: #FFFFFF;
  font-family: helvetica, arial, verdana, courier, sans-serif;
  font-size: 11px;
  line-height: 11px;
}

#gabbia {
  width: 800px;
  height: 600px;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-top: -300px;
  margin-left: -400px;
}

img {
  border: none;
  }