I can not find where the hover-effect for navigation elements is set. When you hover over a menu item, a white background appears (see figure). I did not register it anywhere in css, it is also not detected through firebug, it is applied to li. Searched in bootstrap.js - to no avail. I ask for help 
<nav class="mainMenu"><a class="hamburger" href="#"><i class="fa fa-3x fa-bars" aria-hidden="true"></i></a> <ul class="nav nav-pills" id="menu"> <li class="menuItem animated fadeInRight fadeLeftOut" style="opacity: 1;"><a class="menuLink" href="" title="">главная</a></li> <li class="menuItem animated fadeInRight fadeLeftOut" style="opacity: 1;"><a class="menuLink" href="" title="">о проекте</a></li> <li class="menuItem animated fadeInRight fadeLeftOut" style="opacity: 1;"><a class="menuLink" href="" title="">контакты</a></li> </ul> </nav> 