@mixin HTMLContent () {
  img {
    width: 50%;
    height: auto;
    margin: auto;
    @media only screen and (max-width: 600px){
      width: 100%;
    }
  }
  video {
    width: 50%;
    height: auto;
    margin: auto;
    @media only screen and (max-width: 600px){
      width: 100%;
    }
  }
  .barehtml {
    width: 50%;
    height: auto;
    margin: auto;
    @media only screen and (max-width: 600px){
      width: 100%;
    }
  }
}