Embedded Shiny app appears as blank box

I am creating a personal website with Rmarkdown and I would ideally like to be able to illustrate some of my research using interactive Shiny apps. I can deploy Shiny apps via shinyapps.io without any problem. So far each individual page is working as expected locally. When I publish the website, however, all embedded Shiny apps appear as blank boxes. Here is a link to my website (keep in mind that it is under construction) so you can see what I mean. Do I need a


Any help is appreciated.