Fancy a cool-looking image hover transition using only CSS3? Check out this demo by webdesigncrowd.com. When hovering on the demo image, a diagonal shape layer will smoothly slide-in from the edge to reveal extra information about the image. This pretty simple and creative trick was created using two different shape overlays and merged into one shape. The original shapes are triangle and rectangle. I think the effect is cool but the amount of HTML needed is kinda bulky. Hit the button below to see the full code and demo.