how to fix the footer at the bottom of the page in 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.-->