ক্লিয়ারফিক্স

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

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

.element {
  @include clearfix;
}

<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>