how to get footer fixed on bottom bootstrap code example

Example: 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.-->