Html 5 test page rendering

I am trying to find a theme which will correctly render a test page I am using.

When I place the page on a web server it renders correctly as far as I can tell.
If I publish it using Hugo it shows the page totally different, and different for each theme I try.
Most notably is the area near the bottom which does not render at all.

What do I need to do to make this page show all the elements correctly? Thanks!