It seems to me you’re looking for something like a responsive, fullscreen background slideshow. Something like this:
Just google some combination of the words “fullscreen, background, slideshow, responsive” to find a bunch more.
Something like Senff’s JS can work for you. There’s a couple things we need to do:
Acquiring the dimensions of a window is pretty straightforward, but refreshing the slideshow is typically done within your slider plugin’s [API](http://galleria.io/docs/api/methods/#display “Galleria”).
A great answer is on [StackOverflow](http://stackoverflow.com/questions/5142742/resize-script-for-galleria “StackOverflow”).
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