There are several methods for constructing a background for your vivarium. As John indicated the simplest option is to silicone a tree fern fiber or cork flat against the glass and fill in any gaps with silicone and coco fiber pressed into it.
More advanced backgrounds can be constructed with expanding foam in a can like Great Stuff or a Pond Rated Foam that is safe for fish and plants. You the cover the foam with silicone and a combination of any of the following, peat moss, coco fiber, wood chunks. The object here is to completely cover the foam with this material. With Great Stuff Building Foam it is a yellow/tan color and does not look very good. Pond foam is usually black in color. So you cover it with a brown or black color 100 percent silicone, (No mold inhibitors). Work each area by spreading the silicone and then cover with a generous layer of the peat moss or combination of stuff and press firmly into the silicone. With the pond foam the color is black so if you miss a area it makes very little difference.
The third method is the clay background made of kitty litter or bentonite clay. You want the pure clay kitty litter with no deodorizers added. You add this to a bucket and mix non chlorinated water with it. Let the mix soak for many hours, like overnight. The object here is to break down the kitty litter into smooth paste, Then add sphagnum moss, coco fiber and peat moss to the mixture. Mix it up well and you want a very thick sticky paste that will hold together very well and adheres to glass. Add it to the glass and press into place. Then press another layer of peat moss and other stuff into the clay. With clay you mist every day to keep the clay moist. I'd say within a few weeks you should start to see some moss growth on the clay surface.
Last you can make a background from the combination of all these and many more materials, such as cork rounds, driftwood, ect.
I hope this brief explanation of some methods will help you decide on what to do. I would suggest starting simpler if your ready to take a immediate plunge or do some research here and other forums, YouTube for how to videos or ask away.





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