JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="box"></div>
    <div class="box">
        <h1>123</h1>
    </div>
</div>

CSS

.container{
    height:200px;
    background:blue
}
.box{
    height:100px;
    display:inline-block;
    background-color:
    red;width:50px;
    margin:2px
}