<div id="loading-test" style="height: 300px; width: 100%;">

  <div class="loading" data-mdb-parent-selector="#loading-test">

    <div class="spinner-border " role="status"></div>

    <span class="">Loading...</span>

  </div>

</div>

​

<!-- correct code -->

<!--

  <div id="loading-test" style="height: 300px; width: 100%;">

    <div class="loading" data-mdb-parent-selector="#loading-test">

      <div class="spinner-border loading-icon" role="status"></div>

      <span class="loading-text">Loading...</span>

    </div>

  </div>

-->

<!-- correct code -->

​