Example of an article with varying widths, font-sizes and line-heights depending on the viewport width, written in Sass.

Sass for Designers Example #12

article {
  font-size: 14px;
  line-height: 25px;

  h2 {
    font-size: 18px;
    padding-bottom: 15px;
  }
  
  @media only screen and (min-width: 300px) {
    line-height: 20px;
    width: 90%;
  
    h2 {
      padding-bottom: 10px; 
    }
  }

  @media only screen and (min-width: 600px) {
    line-height: 25px;
    width: 80%;

    h2 {
      padding-bottom: 15px; 
    }
  }

  @media only screen and (min-width: 900px) {
    width: 60%;
  }

  @media only screen and (min-width: 1200px) {
    font-size: 16px;
    line-height: 30px;
    width: 50%;

    h2 {
      font-size: 21px;
      line-height: 35px;
      padding-bottom: 20px; 
    }
  }
}