how to set footer in bottom in bootstrap 4 code example

Example 1: bootstrap footer bottom of page

<!--Use the navbar component and add .navbar-fixed-bottom class:-->

<!--Bootstrap 3.x-->
<div class="navbar navbar-fixed-bottom"></div>

<!--Bootstrap 4.x-->
<div class="navbar fixed-bottom"></div>

<!--Don't forget to add body { padding-bottom: 70px; } or otherwise the page content may be covered.-->

Example 2: bootstrap 4 footer

<!-- Footer -->
<footer class="page-footer font-small blue pt-4">

  <!-- Footer Links -->
  <div class="container-fluid text-center text-md-left">

    <!-- Grid row -->
    <div class="row">

      <!-- Grid column -->
      <div class="col-md-6 mt-md-0 mt-3">

        <!-- Content -->
        <h5 class="text-uppercase">Footer Content</h5>
        <p>Here you can use rows and columns to organize your footer content.</p>

      </div>
      <!-- Grid column -->

      <hr class="clearfix w-100 d-md-none pb-3">

      <!-- Grid column -->
      <div class="col-md-3 mb-md-0 mb-3">

        <!-- Links -->
        <h5 class="text-uppercase">Links</h5>

        <ul class="list-unstyled">
          <li>
            <a href="#!">Link 1</a>
          </li>
          <li>
            <a href="#!">Link 2</a>
          </li>
          <li>
            <a href="#!">Link 3</a>
          </li>
          <li>
            <a href="#!">Link 4</a>
          </li>
        </ul>

      </div>
      <!-- Grid column -->

      <!-- Grid column -->
      <div class="col-md-3 mb-md-0 mb-3">

        <!-- Links -->
        <h5 class="text-uppercase">Links</h5>

        <ul class="list-unstyled">
          <li>
            <a href="#!">Link 1</a>
          </li>
          <li>
            <a href="#!">Link 2</a>
          </li>
          <li>
            <a href="#!">Link 3</a>
          </li>
          <li>
            <a href="#!">Link 4</a>
          </li>
        </ul>

      </div>
      <!-- Grid column -->

    </div>
    <!-- Grid row -->

  </div>
  <!-- Footer Links -->

  <!-- Copyright -->
  <div class="footer-copyright text-center py-3">© 2020 Copyright:
    <a href="https://mdbootstrap.com/"> MDBootstrap.com</a>
  </div>
  <!-- Copyright -->

</footer>
<!-- Footer -->