Clearfix

Bootstrap clearfix is a utility which to automatically clear child elements, so user don't have to add additional markup.

                
<div class="clearfix">...</div>
            
                
// Mixin itself
@mixin clearfix() {
  &::after {
    display: block;
    content: "";
    clear: both;
  }
}

// Usage as a mixin
.element {
  @include clearfix;
}
            

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 class="btn btn-secondary float-left">Example Button floated left</button>
  <button class="btn btn-secondary float-right">Example Button floated right</button>
</div>