[SOLVED] Place image in container at specific height

I'm converting a site into WordPress. The old site was laid out with a background image working with a container image in the middle. However, the container image is about 100 pix down to specifically work with part of the background image.

I've placed the container image into the Container options as a background. Can I bump that down a specific length using margins or calling the image differently (not using background)?

I suppose I could always just merge the two images into one. But I'd like to replicate it as authentically as possible if I can. Thanks!