Hi, the position of the collapse button shouldn't be to hard to fix.
Edit: For fun: try setting the bottom margin of your "content" to 0. I think that's the one playing you the trick. If it is, it's up to you whether you want to pay for it or not.
For your second point I have a question:
Are you looking for a fixed size area in which the text will scroll if there is more then will fit in the area. But all the text is already on the page.
or
Sort of continuous scroll with data dynamically loaded. It doesn't seem to be the case, but just to be sure.
At this moment your whole page is scrolling.
For the delay of delivery: on common agreement.
Kind regards,
Ronald Poell