.viewer {
  min-width: 850px;
  min-height: 600px;
}
.viewer-content {
  position: absolute;
  top: 32px;
  left: 0px;
  width: 100%;
  height: calc( 100% - 32px );
  background-color: white;
}
.viewer-content iframe {
  border: 0px;
}
.viewer-content .loading {
  background-color: white;
}