Bootstrap 4 - Sticky footer - Dynamic footer height

Solution 1:

Now that Bootstrap 4 is flexbox, a sticky footer can be done using...

<wrapper class="d-flex flex-column">
    <nav>
    </nav>
    <main class="flex-fill">
    </main>
    <footer>
    </footer>
</wrapper>

body, wrapper {
   min-height:100vh;
}

.flex-fill {
   flex:1 1 auto;
}

Demo: Bootstrap 4.0 Sticky Footer

Note: The flex-fill utility class is included in the Bootstrap 4.1 and later release. So after that release the extra CSS for flex-fill won't be needed.

As of Bootstrap 4.1, there is a min-vh-100 utility class which means you don't need the extra CSS.

Demo: Bootstrap 4.1+ Sticky Footer

Solution 2:

A very simple way is using a navbar as a footer. It comes with a fixed-bottom class that is really handy. To change your spacing you can see the documentation here... https://getbootstrap.com/docs/4.2/utilities/spacing/

<nav class="navbar fixed-bottom navbar-light bg-light">
  <a class="navbar-brand" href="#">Fixed bottom</a>
</nav>