JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block1">test1</div>
<div class="block2">test2</div>

CSS

.block1 {
       width: auto;
       height: 200px;
       float: left;
       background-color: green;
    }
    .block2 {
       float: left;
       height: 200px;
       width: 200px;
    
       background-color: red;
    }