That page is loading for me in the editor (no error message). However, the reason you don’t see the content regions is because they’re defined only with hidden inputs, making them more or less invisible:
<div id="Bronze" class="editable">
<input type="hidden" name="product" value="Bronze Web Pack">
<input type="hidden" name="discountpr" value="0,650">
I recommend not putting hidden elements or form inputs into editable regions. Users can’t see them so they can very easily be deleted or overwritten.
That said, if you wanted to make the button label or the details of each package editable, that’s totally fine. In that case, you’ll just need to move the
editable class to the appropriate containers