.fd-zone {
  position: relative;
  overflow: hidden;
  /***
    This way you can create a pretty box that will be both clickable and droppable:
   ***
    width: 15em;
    margin: 0 auto;
    text-align: center;
  */
}

.fd-file {
  opacity: 0;
  font-size: 118px;
  position: absolute;
  right: 0;
  top: 0;
  z-index: 1;
  padding: 0;
  margin: 0;
  cursor: pointer;
  filter: alpha(opacity=0);
  font-family: sans-serif;
}

/***
  With .over you can provide feedback when user drags a file over the drop zone:
 ***
  .fd-zone.over { border-color: maroon; background: #eee; }
*/