input forms

[StevenWWinters]

... but it also then changes the background and places a slightly different form at the top of the page...

You have entered the html for a whole webpage into the Web Properties / Website / HTML Code (body) place holder. You should only enter html snippets, not whole pages. The .css file referenced is likely overriding the page background and the form is a result of that html as well. If you remove that code, the page displays as you would expect.