I have WordPress 4.5.2 and Pure & Simple 2.0 theme installed. Somehow I can’t get the sticky menu to work. When I select sticky menu, it works in the preview window in the theme customisation screen. However, after saving the sticky menu doesn’t work on the actual site. See: kuske.co.nz
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Sticky menu on your site is working perfectly but it is hiding just behind the top bar (). And also you had made your top bar fixed at the top. Here is the css you have done to make top bar fixed at the top