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<div class="clearfix">...</div>

// Mixin itself
@mixin clearfix() {
  &::after {
    display: block;
    content: "";
    clear: both;
  }
}

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

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