Basic structure for new layout

gistfile1.scss

// Two Column setup

// markup
%secion.content
  %article
    %section
      %h1 Main section
  %aside
    %section
      %h1 Comment section
  
//styles
// found in default_challege_layout.scss#44
  section.content {
    @include span-columns(12);
    @include row(table);
    aside, article{
      @include pad(30px);

      section {
        @include clearfix;
        margin-bottom: 30px;
      }
      button,
      input[type="submit"]{
        float: right;
      }
    }

    article {
      @include span-columns(7);
      overflow: visible;
    }
    aside {
      @include span-columns(5);
      @include reset-display;
      background-color: $shaping-background-gray;
    }
  }