JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="content-main">
        <div class="main">This is main</div>
    </div>
</div>

CSS

.wrapper {
    width: 500px;
    padding: 30px 0;
    border: 1px solid #0066cc;
}
.content-main {
    padding: 0 20px;
    border: 2px solid #00CC33;
}
.main {
    border: 1px solid #f00;
}