change parent div css on over of child
<ul id="main-menu">
<li>
<a href="#">
<i class="fa fa-building-o" aria-hidden="true"></i>
Private Limited
<i class="fa fa-caret-down"></i>
</a>
<ul class="submenu">
<li><a href="#0">Company</a>
</li>
<li><a href="#0">Contact</a>
</li>
<li><a href="#0">Industry</a>
</li>
</ul>
</li>
</ul>