JSFiddle - React, Tailwind, and code Playground

HTML

<div class="game">
    <div>
    <div class="block1"></div>
    <div class="block2"></div>
    </div>
</div>

CSS

html, body { height: 100%; margin: 0;}
.game {
    position:absolute;
    width:400px; 
    height:100%;
    top: 0; 
    left:100px;
    overflow:hidden;
}
.game > div {
    position: absolute;
    top: 100px;
    height: 300px;
    width: 100%;
    background-color:#cccccc;
}

.block1 {
    position:absolute;
    width:100px; height:100px;
    top:-50px; left:150px;
    background-color:#ffcccc;
}

.block2 {
    position:absolute;
    width:100px; height:100px;
    top:150px; left:-50px;
    background-color:#ccffcc;
}