title: Get dropdown under button in Bootstrap
body: <p>Unfortunately I can't figure it out.</p>
  
  <p>Hopefully a css/bootstrap guru can show me the way in the darkness.</p>
  
  <p><a href="http://fmjd.org/sandbox/" rel="nofollow noreferrer">http://fmjd.org/sandbox/</a></p>
  
  <p><img src="https://i.stack.imgur.com/mdQ7w.png" alt="image">
  When clicking at "Dropdown" I expect the menu to be opened below the button. 
  But it goes to the left.
  What is wrong in the choice of classes/css? </p>
  
  <p>Thank you.</p>