Need help positioning images

First of all, Merry Christmas to everyone! What would make my Christmas perfect is if someone helped me out with a niggling problem I have trying to figure out how to position images inside a CSS box/container/whatever. Here's a sample pic below.

The second pic is supposed to be on the right side of the red container, but for some reason it just stays underneath the first pic. Here's the code:

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Need help positioning images

Poster :