Post area aren't sync with auto-resizing featured image when resize the browser

I’m working with fluid and responsive site..

cd.zz.mu/h

when you open that site and resize the browser (mobile site view @480px wide) i found a problem that the post area are disordered. I want the image is auto-resize when i resizing the browser and it works, the images become proportional but why the post area didn’t follow the size of the featured image.. Well, my english isn’t good..

Anyone can help me ?? ??