i understand that problem is z-index and webkit ,but not decide it
I’m fairly sure that your problems are a result of using fixed/absolute positioning basically everywhere. I’m sure there is one “magic” screen size (i.e., your screen size) where everything looks basically correct, but I can’t find it. I can’t even see the whole site unless the window is greater than 1080 pixels wide. It is very difficult to work with.
Try learning better ways of laying out pages.
Absolute/Relative positioning has its place for specific effects but as a page layout method…its worse than tables.