.responsive-left {
  width: 80%;
  max-width: 600px;
  display: block;
  height: auto;
  margin: 10px auto;
  
}

 @media only screen and (min-width: 768px) {
  /* For desktop: */
  .responsive-left {
    width: 33%;
    height: auto;
    float: left;
    margin: 20px;
  }
 }