HTML:Ex:Getbootstrap.com/components/Button dropdowns/Single button dropdowns

 <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" 
     aria-haspopup="true" aria-expanded="false">Default </button>

• <a href="#">Action</a>
• <a href="#">Another action</a>
• <a href="#">Something else here</a>
• <a href="#">Separated link</a>

 <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" 
     aria-haspopup="true" aria-expanded="false">Primary </button>

• <a href="#">Action</a>
• <a href="#">Another action</a>
• <a href="#">Something else here</a>
• <a href="#">Separated link</a>

 <button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" 
     aria-haspopup="true" aria-expanded="false">Success </button>

• <a href="#">Action</a>
• <a href="#">Another action</a>
• <a href="#">Something else here</a>
• <a href="#">Separated link</a>

 <button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown" 
     aria-haspopup="true" aria-expanded="false">Info </button>

• <a href="#">Action</a>
• <a href="#">Another action</a>
• <a href="#">Something else here</a>
• <a href="#">Separated link</a>

 <button type="button" class="btn btn-warning dropdown-toggle" data-toggle="dropdown" 
     aria-haspopup="true" aria-expanded="false">Warning </button>

• <a href="#">Action</a>
• <a href="#">Another action</a>
• <a href="#">Something else here</a>
• <a href="#">Separated link</a>

 <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" 
     aria-haspopup="true" aria-expanded="false">Danger </button>

• <a href="#">Action</a>
• <a href="#">Another action</a>
• <a href="#">Something else here</a>
• <a href="#">Separated link</a>