From the Administration menu you can click on "Graphical options" under "Global settings":

You will then reach an interface allowing to manage the graphical display settings of your Opigno instance.

This makes possible to load a different logo and favicon for your Opigno instance:

and manage the content (background image, text) of the homepage before authentication. You can have several contents within a slider for that authentication page, you can just click on "Add another slide" button to add additional slides.

You can also enter some custom CSS rules in the "CSS overrides" part, at the bottom:

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