Link to pen with problem: http://codepen.io/kostanakis/pen/MepJYq
In the current code, a drop-down menu appears over the main menu bar. It comes to mind to use z-index, but this parameter does not work with position: absolute. If you set the position:relative; then it gets worse. How to be?
UPD: The nuance is that if you shift the block of the drop-down menu below, then when you move the cursor to this block it disappears: hover, the menu is hidden.