HTML:Ex:Getbootstrap.com/components/Button dropdowns/Sizing

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

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

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

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

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

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

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

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