PTCL Work Menu

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<div id="MainMenu">
    <div class="list-group panel">
        <a href="#why" class="list-group-item active" data-toggle="collapse" data-parent="#MainMenu">Menu 1</a>
        <div class="collapse" id="why">
            <a href="" class="list-group-item" data-toggle="collapse" data-parent="#SubMenu1">Menu 1 a</a>
            <a href="#" class="list-group-item">Menu 1 b</a>
            <a href="#" class="list-group-item">Menu 1 c</a>
            
            <a href="#" class="list-group-item">Menu 1 d</a>
            
            <a href="#" class="list-group-item">Menu 1 e</a>
            
            <a href="#" class="list-group-item">Menu 1 f</a>
        </div>
        <a href="#joinus" class="list-group-item" data-toggle="collapse" data-parent="#MainMenu">Menu 2</a>
        <div class="collapse" id="joinus">
            <a href="#" class="list-group-item">Menu 2 a</a>
            <a href="#" class="list-group-item">Menu 2 b</a>
            <a href="#" class="list-group-item">Menu 2 c</a>
            <a href="#" class="list-group-item">Menu 2 d</a>
            <a href="#" class="list-group-item">Menu 2 e</a>
        </div>
    </div>
</div>

CSS

.list-group panel.active {
  background-color: #ff0000;
  border-color: #aed248;
}