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our widget is an iframes, and can only do what your site allows

the iframe cannot make your page taller, but you can make your page taller and the iframe will expand down.

Try this:

.rs-widget-container {
  position: relative;
  height: 2700px; 
}

instead of:

.rs-widget-container {
  position: relative;
  padding-bottom: 56.25%;
  padding-top: 35px;
}