JSFiddle - React, Tailwind, and code Playground

HTML

<div>123</div>

<iframe width="560" height="315" src="http://www.youtube.com/embed/NeXMxuNNlE8?wmode=transparent" frameborder="0" allowfullscreen></iframe>

<!-- Remove "?wmode=transparent" to see the difference. -->

CSS

div {
    background: orange;
    border: 1px solid orangered;
    left: 20px;
    padding: 10px;
    position: absolute;
    top: 20px;
}