UI layout issues on 2560 x 1600 display

[eneerhut]

trafficstars

The layout of the editing tools are a bit problematic on my 13", 2560 x 1600 display.

[Binnette]

Also, I think that the map is too big. It should take less than 50%. May be 40% ?

On my screen 1920*1080. I get a white bar down the website. This white space also cause a vertical scrollbar to be displayed by Firefox.