vertical
         * layout if the children just have a min-height. For those tests,
         * use a fixed height instead. */
        .container > div.fixed-height {
          min-height: 0;
          height: 50px;
        }
        .container.relative > div {
          min-width: 50px;
          min-height: 50px;
          width: inherit;
        }
        .container.small { width: 120px; }
        .container.tall { height: 300px; }

        #c1 { background-color: #E91E63; }
        #c2 { background-color