CSS button/div border overlap

Hi everyone,

This is my first post here so please forgive me if I'm asking in the wrong place, or too soon. I have a somewhat unique question, which should be easy to answer but hard to find the answer to.

If you look at my design, I'm trying to get the blue 1 px border for the top menu buttons to overlap the white 1 px border of the container div. Is this possible? Or do I need to use something besides CSS borders for what I want to do?

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