<h1>
  Break right after this and <span>before this</span>
</h1>

@import url(https://fonts.googleapis.com/css?family=Open+Sans:300,700);

body {
  padding: 20px;
  font-family: 'Open Sans', sans-serif;
}

h1 {
  text-align:center;
  font-weight: 300;
  font-size: 24px;
  line-height: 1.6;
  background: #eee;
  padding: 10px;
  margin: 0!important;
  

  span {
    @media (min-width: 1024px){
      display: block;
      background-color: rgba(red, 0.25);
      margin-left: auto;
      margin-right: auto;
    }
  }
}