white;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .item:nth-child(3) { width: 160px; }
    .item:nth-child(10) { width: 120px; }
    .item:nth-child(16) { width: 140px; }
  </style>
</head>
<body>
<div class="container">
  <div class="item">1</div><div class="item">2</div><div class="item">3</div><div class="item">4</div>
  <div class="item">5</div><div class="item">6</div><div class="item">7</div><div class="item">8</div>
  <div class="item">9</div><div class="