JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.wrapper {border:black solid;
width:500px;height:1000px}
.block1 {width:300px;height:300px;float:right;border:solid red;}
.block2 {width:300px;height:300px;border:solid green;}