Hi @Helena Gonçalves ,
the easiest way to create a coloured background for your drawings is putting them into a panel and change the background-color of the panel.
Changing the background-color for a page is otherwise not so easy. You have to allow HTML in your page (which I would never do) or create a user macro which adds some custom CSS to your page, e.g. like it is described here:
But maybe the panel is fitting your needs as well - it is very simple to use.
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