bootstrap/docs/4.0/utilities/position.md

layout	title	description	group	toc
docs	Position	Use these shorthand utilities for quickly configuring the position of an element.	utilities	true

Fixed top

Position an element at the top of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add aditional CSS.

{% highlight html %}

...

{% endhighlight %}

Fixed bottom

Position an element at the bottom of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add aditional CSS.

{% highlight html %}

...

{% endhighlight %}

Sticky top

Position an element at the top of the viewport, from edge to edge, but only after you scroll past it. The .sticky-top utility uses CSS's position: sticky, which isn't fully supported in all browsers.

{% highlight html %}

...

{% endhighlight %}