se's 'inner' text is taller than the button, don't let
       it influence its line-box's size.  This lets us more-easily compare
       sizing between empty buttons vs. contained nonempty buttons. */
    vertical-align: top;
  }
  .vaBaseline {
    vertical-align: baseline;
  }
  .innerContents {
    color: transparent;
    height: 100px;
    width: 100px;
  }
  .minWidth {
    min-width: 50px;
  }
  .width {
    width: 50px;
  }
  .minHeight {
    min-height: 50px;
    background: lightblue;
  }
  .height