style.css

.dnd-drag-start {
  -moz-transform:scale(0.8);
  -webkit-transform:scale(0.8);
  transform:scale(0.8);
  opacity:0.7;
  border: 2px dashed #000;
}

.dnd-drag-enter {
  opacity:0.7;
  border: 2px dashed #000;
}

.dnd-drag-over {
  border: 2px dashed #000;
}

.dnd-sortable-drag {
  -moz-transform:scale(0.9);
  -webkit-transform:scale(0.9);
  transform:scale(0.9);
  opacity:0.7;
  border: 1px dashed #000;
}