Remains

Remains, also billed as Steve Niles' Remains, is a 2011 post-apocalyptic horror film. It depicts a small group of people in a Reno, Nevada casino who have survived a nuclear disaster while the rest of humanity has been turned into flesh eating zombies. It was produced by the Chiller Network and is based on the comic book series of the same name.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.