Board Thread:Support Requests - Designing Your Wiki/@comment-33708304-20190807071605/@comment-38729545-20190808044657

Fandyllic wrote: You must just be assuming height is mentioned, but it isn't. The Help:Theme Designer page doesn't mention "height" or "tall" or "vertical" either. Let me put it in another way that is simple and easy to understand.

900x1200 is the combination of Height x Width in pixels, which is something the help page has listed.

To get a more throughly understanding of this, you need to know pixel dimensions as mentioned in this link I will post to you: https://www.iprintfromhome.com/mso/understandingdpi.pdf