JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="element1"></div>
    <div class="element2"></div>
</div>

CSS

body {
    margin:0px;
}
.element1 {
    margin-bottom:10px;
}
.element2 {
    margin-top:10px;
    border:1px solid #000;
    height:30px;
}