Sitenin csslerinide cekebılırsiniz.
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>Bootstrap hover</title>
<link rel='stylesheet' href='http://kybarg.github.io/bootstrap-dropdown-hover/assets/bootstrap/css/bootstrap.min.css'>
<link rel='stylesheet' href='http://kybarg.github.io/bootstrap-dropdown-hover/assets/bootstrap-dropdownhover/css/animate.min.css'>
<link rel='stylesheet' href='http://kybarg.github.io/bootstrap-dropdown-hover/assets/bootstrap-dropdownhover/css/bootstrap-dropdownhover.min.css'>
</head>
<body>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown" data-hover="dropdown">
Dropdown <span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li class="dropdown">
<a href="#">One more dropdown</a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li class="dropdown">
<a href="#">One more dropdown</a>
<ul class="dropdown-menu">
...
</ul>
</li>
<li><a href="#">Something else here</a></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
<li><a href="#">Something else here</a></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js'></script>
<script src='http://kybarg.github.io/bootstrap-dropdown-hover/assets/bootstrap/js/bootstrap.min.js'></script>
<script src='http://kybarg.github.io/bootstrap-dropdown-hover/assets/bootstrap-dropdownhover/js/bootstrap-dropdownhover.js'></script>
</body>
</html>