set footer according to bottom bootstrap 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: how to make footer static bootsrap
<div class="sticky-top">...</div>