border: blue solid 3px;
      width: 200px;
    }

  div.inner
    {
      background-color: yellow;
      height: 50px;
      width: 50px;
      writing-mode: vertical-rl;
    }

  div.foo
    {
      margin-bottom: 2.5%; /* 5px ; collapses with hr's margin-top */
      margin-left: 50%; /* 100px */
      margin-right: 25%; /* 50px */
      margin-top: 10%; /* 20px */
    }

  hr
    {
      background-color: transparent;
      border: transparent none 0px;
      height: 3px;
      margin: 0.5em auto;
    