Our detectives are back with the following intel on this WordPress site
The site is using the MH Magazine lite theme by MH Themes .
We could identify 3 plugins (there might be more) - Sticky Menu on Scroll, Sticky Header for Any Theme – myStickymenu , W3 Total Cache and WPFront Scroll Top
MH Magazine lite is one of the most popular free responsive magazine, news and blog WordPress themes for modern online magazines, dynamic news websites, professional blogs and other editorial websites. This free magazine theme is perfectly suitable for topics like international news, politics, lifestyle, fashion, business, sports, gadgets, travel or anything else. If you would like to gain access to more awesome features, flexible custom widgets and useful options to customize your website, you can upgrade to the premium version of MH Magazine and take your website to the next level. You can also learn more about this dynamic magazine WordPress theme on the MH Themes website.
This sticky menu plugin will make your menu or header stick to the top of page, after desired number of pixels when scrolled down and up.