JSFiddle - React, Tailwind, and code Playground

HTML

<div class = "container">
    <div class = "background">
        <div class = "content">
            content
        </div>
    </div>
</div>

CSS

.container {
    width: 500px;
    background-color: lightgreen;
    margin: 0 auto;
}
.background {
    width: 600px;
    margin: 0 auto;
    background-color: blue;
}
.content {
    width: 200px;
    background-color: lightblue;
    margin: 0 auto;
}