application.css

body {
  width: 970px;
  margin: 0 auto; }

.presentation {
  margin-left: -15px;
  margin-right: -15px; }
  .presentation:before, .presentation:after {
    content: " ";
    display: table; }
  .presentation:after {
    clear: both; }
  .presentation aside {
    position: relative;
    min-height: 1px;
    padding-left: 15px;
    padding-right: 15px; }
    @media (min-width: 768px) {
      .presentation aside {
        float: left;
        width: 41.66667%; } }
    .presentation aside img {
      width: 100%;
      height: auto; }
  .presentation section {
    float: none !important;
    position: relative;
    min-height: 1px;
    padding-left: 15px;
    padding-right: 15px; }
    @media (min-width: 768px) {
      .presentation section {
        float: left;
        width: 58.33333%; } }