title: Add gap between input and button using input-group
body: <p>How can I add a gap between the input and the button using <code>input-group</code> on Bootstrap 3? <strong><a href="http://jsfiddle.net/brunodd/qefoLdwa/" rel="nofollow">jsFiddle</a></strong></p>
  
  <pre><code>&lt;div class="container"&gt;
      &lt;div class="row"&gt;
          &lt;div class="col-md-12"&gt;
              &lt;h1&gt;Example&lt;/h1&gt;
              &lt;div class="input-group"&gt;
                 &lt;input type="text" class="form-control"&gt;
                 &lt;span class="input-group-btn"&gt;
                      &lt;button class="btn btn-default" type="button"&gt;Go!&lt;/button&gt;
                 &lt;/span&gt;
              &lt;/div&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>