@media screen and (min-width: 720px) {
    .row div {
      width: 720px;
    }

    .row div img {
      width: 100%;
    }
    .row div img.halfwidth {
      width: 50%;
    }
    .row div img.thirdwidth {
      width: 33%;
    }

    header {
    width: 720px;
  }

  footer {
    width: 720px;
  }

  nav {
    margin: 18px 0px 8px 0px;
    float: right;
  }

  nav a {
    display: inline-block;
    float: left;
  }

  .youtube {
      width: 560px;
      height: 315px;
  }
}