tp://www.w3.org/TR/css-overflow-3/#overflow-properties
     So, "overflow-y" has an indirect effect (via "overflow-x") here.
-->
    <style>
      .flexbox {
        display: flex;
        width: 30px;  /* Shrink flex items below min-width */
        margin-bottom: 2px; /* (Just for spacing things out, visually) */
      }

      .flexbox > * {
        /* Flex items have purple border: */
        border: 2px dotted purple;
      }

      .flexbox > * > * {
        /* Flex items' contents are gray & fixed-si