ge;
      height: 150px;
      width: 100px;
      flex: 1 0 auto;
    }
    .second-item {
      background: blue;
      height: 150px;
      width: 100px;
      flex: 1 0 auto;
    }
  </style>
</head>
<body>
  <div class="flexbox">
    <div class="first-item"></div>
    <div class="second-item"></div>
  </div>
</body>
</html>
