JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="window">
        <div class="windowContent">
        1
        </div>
    </div>

    <div class="window">
        <div class="windowContent">
        2
        </div>
    </div>

<div class="window">
        <div class="windowContent">
        3
        </div>
    </div>

</div>

CSS

.wrapper
    {
      height: 100%;
      width: 100%;
      display: flex;
    }

    .window
    {
      width: 100%;
      min-height: 200px;
      background-color: #666;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .windowContent
    {
      background-color: #000;
      color: #fff;
    }