 flex: 1 0 30px;
        background: lightgreen;
        writing-mode: vertical-lr;
      }
      div.b {
        flex: 2 0 20px;
        background: yellow;
        writing-mode: vertical-rl;
      }
      div.c {
        flex: 3 0 40px;
        background: orange;
        writing-mode: sideways-lr;
      }
      div.flexNone {
        flex: none;
        background: pink;
        writing-mode: vertical-lr;
      }
      div.flexBasis {
        flex: 0 0 20px;
        background: gray;
        writing-mode