I am building a site in Wordpress and need the home page to have 3 boxes on the left side of the screen and a bg image that fills the rest of the body box. When one of the boxes is hovered over, a second box needs to slide out/ become visible to the right with a description and a clickable link. At that same time the bg image will change to a different image and size so as not to overlap the new box that has slid out.
Prefer that boxes appearance be able to be stylized by css rather than image file. Needs to fit design specs of site.
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I have attached a wireframe of what I am looking for.