title: Bootstrap 3 border radius missing in input-group
body: <p>Using Bootstrap 3.4 why the input-group missing all border radius ?</p>
  
  <pre><code>&lt;form action="{{ route('dashboard.users.index') }}" method="get"&gt;
     &lt;div class="input-group"&gt;
          &lt;input type="text" name="search" class="form-control"&gt;
          &lt;span class="input-group-btn"&gt;
             &lt;button class="btn btn-default" type="submit"&gt;
               &lt;i class="fa fa-search"&gt;&lt;/i&gt;
             &lt;/button&gt;
           &lt;/span&gt;
       &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>
  
  <h2>inspect element:</h2>
  
  <pre><code>.input-group .form-control:first-child, .input-group-addon:first-child, .input-group-btn:first-child&gt;.btn, .input-group-btn:first-child&gt;.btn-group&gt;.btn, .input-group-btn:first-child&gt;.dropdown-toggle, .input-group-btn:last-child&gt;.btn-group:not(:last-child)&gt;.btn, .input-group-btn:last-child&gt;.btn:not(:last-child):not(.dropdown-toggle) {
      border-top-right-radius: 0;
      border-bottom-right-radius: 0;
  </code></pre>
  
  <p>Should I fix it with my own css?</p>