Easily clear floats by adding .clearfix to the parent element.
<div class="clearfix">...</div>
The following example shows how the clearfix can be used. Without the clearfix the wrapping div would not span around the buttons which would cause a broken layout.
<div class="bg-info clearfix">
<button type="button" class="btn btn-secondary float-start">Example Button floated left</button>
<button type="button" class="btn btn-secondary float-end">Example Button floated right</button>
</div>