It sorta pools at the bottom.
It’s called [Livor Mortis](https://en.wikipedia.org/wiki/Livor_mortis) (warning that link has a picture of dead person in it)
Within 2 hours you can start seeing something that like a bruise on the entire bottom side.
Normally your body pumps blood out of the little blood carrying capillaries.
Since your body isn’t doing that any more the blood gets stuck, making it look like a bruise.
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