Branding icon on top

Hi,

We want to add our branding icon on top of the menubar in theia. Adjusted the height of the top-panel for that, as well as the position of the main area. It looks like the below image.

However, the problem is that the scrolling area of the explorer pane is not correctly adjusted after a resize. When the scrollbar is at the bottom, the last item is not visible and the last but one item only half.

Any idea how this can be fixed ?

Any help appreciated.