Change the notebook's background colour

[philipsync (Philip _)]

I’m trying Wolfram cloud for the first time. I find the white background colour of the notebook too bright. Is there a way to make the background darker. I can only see how to change the colour of the cells not the page as a whole.

[rolfm (Rolf Mertig)]

SetOptions[SelectedNotebook,Background->LightGray];

[philipsync (Philip _)]

Thanks