<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div id="col-md-3">
<div class="list-group panel">
<a class="list-group-item list-group-item strong text-center" style="background: #009ce0; color: white;" data-toggle="collapse"> Personalize Your Search</a>
<a href="#demo1" class="list-group-item list-group-item-success strong" style="background: #f7f7f7;" data-toggle="collapse" data-parent="#MainMenu"><i class="fa fa-photo"></i> Resource Type <i class="fa fa-caret-down"></i></a>
<div class="collapse list-group-submenu" id="demo1">
<a href="#" class="list-group-item"><input type="checkbox">· Audio Content</a>
<a href="#" class="list-group-item"><input type="checkbox">· Interactive Media</a>
<a href="#" class="list-group-item"><input type="checkbox">· Learning Game</a>
<a href="#" class="list-group-item"><input type="checkbox">· Video</a>
</div>
<a href="#demo2" class="list-group-item list-group-item strong" style="background: #f7f7f7;" data-toggle="collapse" data-parent="#MainMenu"><i class="fa fa-book"></i> Readability <i class="fa fa-caret-down"></i></a>
<div class="collapse list-group-submenu" id="demo2">
<a href="#" class="list-group-item"><input type="checkbox">· 1</a>
<a href="#" class="list-group-item"><input type="checkbox">· 2</a>
<a href="#" class="list-group-item"><input type="checkbox">· 3</a>
<a href="#" class="list-group-item"><input type="checkbox">· 4</a>
<a href="#" class="list-group-item"><input type="checkbox">· 5</a>
</div>
<a href="#demo4" class="list-group-item list-group-item strong" style="background: #f7f7f7;" data-toggle="collapse" data-parent="#MainMenu"><i class="fa fa-language"></i> Languages <i class="fa fa-caret-down"></i></a>
<div class="collapse list-group-submenu" id="demo4">
<a href="#" class="list-group-item"><input type="checkbox">· English</a>
<a href="#" class="list-group-item"><input type="checkbox">· Chinese</a>
<a href="#" class="list-group-item"><input type="checkbox">· French</a>
<a href="#SubSubMenu1" class="list-group-item strong" data-toggle="collapse" data-parent="#SubSubMenu1"> 3 more <i class="fa fa-caret-down"></i></a>
<div class="collapse list-group-submenu list-group-submenu-1" id="SubSubMenu1">
<a href="#" class="list-group-item"><input type="checkbox">· Russian</a>
<a href="#" class="list-group-item"><input type="checkbox">· Urdu</a>
<a href="#" class="list-group-item"><input type="checkbox">· Vietnamese</a>
</div>
</div>
<a href="#demo5" class="list-group-item list-group-item strong" style="background: #f7f7f7;" data-toggle="collapse" data-parent="#MainMenu"><i class="fa fa-cubes"></i> Content Collections <i class="fa fa-caret-down"></i></a>
