#iframe-wrapper {
  position: relative;
  min-height: 600px;
  background: #f8f8f8;
}
#iframe-wrapper iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: none;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}
#loading-text {
  text-align: center;
  padding: 80px 0;
  color: #666;
  font-size: 18px;
}
#loading-username {
  color: darkgreen;
}