JSFiddle - React, Tailwind, and code Playground

HTML

<div class="my-container">
<div class="margin">
    Hello World
</div>
<div class="margin">
    Hello World
</div>

CSS

.my-container {
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
width: 300px;
background-color: #3873fe;
margin: auto;
}

.my-container .margin {
    width: 100px;
    margin: 0 auto 50px;
    background-color: #00ff82;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    display: inline-block;
    width: 100%;
}