#iframe-wrapper-1 {
  position: relative;
}
#iframe-wrapper-2 {
  height: 6000px;
  overflow-x: hidden;
  position: relative;
}
#join-iframe {
  width: 100%;
  height: 100%;
  max-width: 100%;
  transition: opacity 0.3s ease-in-out;
  opacity: 1;
}