It is possible to add a custom background to a portal's Homepage as follows:
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In the Homepage administration interface, select the Presentation tab.
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In the Background section, select Upload image to add a new image or Replace to override an existing one.
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Select an image available locally.
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Select Save in the Homepage administration interface.
The size of the image file must not exceed 3 MB.
Select Preview in the Homepage administration interface to see how the background image is rendered before saving.