Bootstrap datepicker hidden by the container div

Question

I have a birthday input text where I use Bootstrap datepicker v4.

The form is inside <div class="media"> container. As shown in the pic, the datepicker calendar is hidden by the border of the "media" div, I can't solve this with z-index, it didnt work. When I use overflow: visible for both class: media and tab-content, The fields lost their width and the display layout is changed (see second pic).

<link href="//cdn.rawgit.com/Eonasdan/bootstrap-datetimepicker/e8bddc60e73c1ec2475f827be36e1957af72e2ea/build/css/bootstrap-datetimepicker.css" rel="stylesheet">
<script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.9.0/moment-with-locales.js"></script>
<script src="//cdn.rawgit.com/Eonasdan/bootstrap-datetimepicker/e8bddc60e73c1ec2475f827be36e1957af72e2ea/src/js/bootstrap-datetimepicker.js"></script>

<div class="tab-wrap">
  <div class="media">
    <div class="parrent pull-left">
      <ul class="nav nav-tabs nav-stacked">
        <li class="active"><a href="#tab1" data-toggle="tab" class="analistic-01"><?= lang('BASIC_INFO'); ?></a></li>
        <li class=""><a href="#tab2" data-toggle="tab" class="analistic-02"><?= lang('PUBLIC_PROFILE'); ?></a></li>
        <li class=""><a href="#tab3" data-toggle="tab" class="tehnical"><?= lang('INTERESTS'); ?></a></li>
        <li class=""><a href="#tab4" data-toggle="tab" class="tehnical"><?= lang('FOTOS'); ?></a></li>
      </ul>
    </div>

    <div class="parrent media-body">
      <div class="tab-content">
        <div class="tab-pane fade active in" id="tab1">
          <div class="media">    
            <div class="media-body">     
              <div class="form-group">
                <div class='input-group date' id='datetimepicker1'>
                  <input type='text' id='bdate' name='bdate' class="form-control" value="<?= $userProfile ? $userProfile['bdate'] : '' ?>"/>
                  <span class="input-group-addon">
                    <span class="glyphicon glyphicon-calendar"></span>
                  </span>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

Result after suing overflow: visible;

Answer 1

Look for overflow: hidden; on the parent containers such as .media, and see if you can override that or remove it if it's set (overflow: visible; would be the override).

I'm just guessing as I don't know what your complete CSS looks like, but another possibility might be that the z-index you tried applying is being overridden because the rule you used is less specific than the one in Bootstrap's CSS. Check the applied styles in your browser developer tools to verify that the z-index you provided is taking precedence.