title: Black box around input button in OPERA?
body: <ol>
  <li>List item</li>
  </ol>
  
  <p>Why is a black box appear around input button in opera.
  Here is the jsfiddle link.
  <a href="http://jsfiddle.net/PKRRj/" rel="nofollow noreferrer">http://jsfiddle.net/PKRRj/</a></p>
  
  <p>try clicking on the button <br /></p>
  
  <p>TRY in OPERA. No problem with the other browsers.</p>
  
  <p>Additional Information regarding Browser.</p>
  
  <p>About Opera <br />
  Version information
  Version
  11.50</p>
  
  <p>Build
  1074</p>
  
  <p>Platform
  Win32</p>
  
  <p>System
  Windows 7</p>
  
  <ul>
  <li>What i did</li>
  </ul>
  
  <p>Clicked once on the button
  <img src="https://i.stack.imgur.com/AiDSa.png" alt="enter image description here"></p>