Slider goes in front of Menu

I have the same problem, slider overlaps the Top Menu when scrolling down the main page.

WP 3.8.1
Cyclone 2.8.2
WP Theme: TwentyFourteen

Be sure your container uses relative position. For example:
Without “position:relative” the z-index will not always work in the example below. Note: nav contains an unordered list styled as a drop-down menu.

#main-navigation nav {
  position:relative;
  z-index:1000;
}