Background Resize based on viewers resolution?

Luciferia

Member
Does anyone know how to make it so that backgrounds resize based on what resolution the viewer is using?

I made a bunch of themes at 1920x1080, and then found out a lot of my members are using really small resolutions still. I would like a way to make the backgrounds fit, without having to resize the images myself and uploading entirely new themes.
 
Sorry try this one:

Code:
background-size: contain;

I just tested that with a large background image that exceeded my browser. Adding this property successfully shrunk the image to fit.
 
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