Getting the Buy Button on top of the photo

Hi - here's my website:

I'm trying to get the buy button to overlay the photo. Basically I want it to be at the bottom left corner of the photo on top of it, rather than actually below the photo.

In the preview area, it looks like what I want, but on my blog, the button is present BEHIND the photo instead of on top of it. I've tried a bunch of different things but having trouble figuring it out. Please help!
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