Regards the grey line...I too use an iPad.....usually on just looking at the website it just sinks to the bottom....so can be ignored....occasionally it pops up when I am trying to post.............
........bugger ....it's not doing it now???
Thinking back I "think" you can get rid of it by just " dragging" above or below.
Sorry, it has not happened this time so not explaining it very well...