JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main-container">
    <div class="left-container">Left container</div>
    <div class="right-container">
        <div class="half-containers">
          Top right<br>
          Top right<br>
          Top right<br>
          Top right<br>
          Top right<br>
          Top right<br>
          Top right<br>
          Top right<br>
         </div>
        <div class="half-containers">Bottom right</div>
    </div>
</div>

CSS

html, body {
            height: 100%;
            background-color: #FFF;
            margin: 0;
            padding: 0;
        }
        body {
            display: flex;
            justify-content: center;
            align-items: flex-start;

            margin-top: 2em;
        }
        div {
            box-sizing: border-box;
            
        }
        .main-container {
            display: flex;
            width: 50%;
            height: 75%;
            max-height: 75%;
            border: 1px solid red;
        }
        .left-container {
            flex: 0 1 50%;
            min-height: 100%;
            max-width: 50%;
            border: 1px solid red;
            background: #0BDA51;
            padding: .5em;
        }
        .right-container {
            flex: 0 1 50%;
            display: flex;
            height: 100%;
            max-width: 50%;
            flex-wrap: wrap;
            align-items: flex-start;
        }
        .half-containers {
            flex: 0 0 100%;
            max-height: 50%;
            min-height: 50%;
            max-width: 100%;
            background: #0BDA51;
            border: 1px solid red;
            padding: .5em;
            overflow: hidden;
        }