JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child"></div>
</div>

CSS

.parent {
    position: relative;
    overflow: hidden;
    height: 100px;
    background: #ccc;
}
.child {
    position: absolute;
    top: 100%; left: 0;
    width: 100%; height: 10px;
    background: #900;
}
.extra {
    position: relative;
    height: 0;
}

JavaScript

var $parent = $(".parent"),
    $child = $(".child"),
    extra_html = '<div class="extra"></div>',
    $extra;

$parent.after(extra_html);
$extra = $(".extra");
$child.appendTo($extra);