learnr tutorials render with a grey screen

I recently built a RStudio Sever instance on CentOS and most functionality appears to be working as expected.

However when I try and run a learnr tutorial, the rendered page appears with an opaque and the none of the buttons work (run code, start over etc). I'm not very familiar with R and was wondering if I've missed something obvious in my setup. Any assistance would be much appreciated.

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