After Selector

After Selector example

HTML

<section class="container clearfix">
  <div class="col-6">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has''' been the industry's standard dummy text ever</div>
  <div class="col-6">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever</div>
</section>

CSS

.container{
  background: #ccc;
  padding:10px;
}

.clearfix:after{
  content:"";
  clear:both; 
  height:0; 
  display:block;
}
/* .clearfix:after {
  content: 'asdfasf';
    display: block;
    clear: both;
    visibility: hidden;
    height: 0;
} */
.col-6{
  float:left;
  padding:0 15px;
  width:50%;
  box-sizing:border-box;
}