 5px solid rgba(0,0,0,0.85);
      padding: 10px;
    }
    </style>
  </head>
  <body>

    <section>
      <div>This is a box</div>
      <div>This is a box</div>
      <div>This is a box</div>
    </section>

    <button class="create">Create box</button>
    <button class="reset">Reset demo</button>
    

    <script>
      var section = document.querySelector('section');
      var createBtn = document.querySelector('.create');
      var resetBtn = document.querySelector('.reset');

      function creat