"Click to add a cell" button overlaps with cell output

[dlqqq]

Description

[ellisonbg]

I think this is related to the virtual scrolling issues in JupyterLab. There is a sequence of PRs that have been merged recently that should improve the situation - see this list for details. I am going to close this, but if we believe it is an issue in Jupyter Server Documents, feel free to reopen this one.