#previewLoadingDiv {
  position: absolute;
  left: 50%;
  visibility: hidden;
  border: 1px solid #334515; 
  background-color: #f0f0f0;
  padding: 20px;
}
#previewDiv {
  overflow: hidden;
  position: absolute;
  left: 50%;
  visibility: hidden;
  z-index: 100;
  border: 1px solid #a0a0a0;
}