JSFiddle - React, Tailwind, and code Playground

HTML

<div id="1">
  this is a div
</div>

<script>
d3.select('[id="1"]').append("div");
</script>

CSS

div {
	border:solid 1px red;
	padding:5px;
}

div div {
	border-color:blue;
	border-width: 3px;
}