Hey,
sorry for the late reply – the new updates to the WordPress plugin pages is quite confusing and I completely missed your message!
Regards to your question, this is not possible unfortunately because the way this plugin works, it’s using WordPress’s core function called wp_die() and all the markup and page layout coming from there and it’s not possible to filter this just yet. I’ve opened a ticket in core to add some filters but this has not been added and I’m not sure if it ever will be.
I think there is a way how to style this by overwriting this function in your theme / plugin but that might get a bit tricky and I haven’t tried that.
I hope this helps, sorry for the inconvenience.
Lukas