Can´t get rid of misterious colouring of layout

My obsidian got couloured misteriously and I don´t know why or how to get rid of it.

It looks like this.

I must have clicked on something on the Ipad app but I could not undo it.
Sorry for such a vage description. I hope someone knows what I did there.
Thanks in advance!

If you are using the Minimal theme, it may be this:

Thanks very much! That was it!

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