Single post in Site Skins: How-To, and Helpful CSS

Hi :D , could anybody help me with a like image overlay thing? So i have some melan bait in my bio and i would like the picture to go ower the whole bio and than when you click or hower over it for it to show my little "things and stuffs" that are curently under the image in mi bio, if this is possible XD Please help and thanks :D