JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script src="http://d3js.org/d3.v3.min.js"></script>
<body>
     <h2>
      Flare code size<br>
      circle packing
    </h2>

    <div id="svg-container"></div>
</body>

CSS

/* body {
    font: 300 36px"Helvetica Neue";
    height: 640px;
    margin: 80px 160px 80px 160px;
    overflow: hidden;
    position: relative;
    width: 960px;
} */
 a:link, a:visited {
    color: #777;
    text-decoration: none;
}
a:hover {
    color: #666;
}
blockquote {
    margin: 0;
}
blockquote:before {
    content:"“";
    position: absolute;
    left: -.4em;
}
blockquote:after {
    content:"”";
    position: absolute;
}
body > ul {
    margin: 0;
    padding: 0;
}
h1 {
    font-size: 64px;
}
h1, h2, h3 {
    font-weight: inherit;
    margin: 0;
}
/* h2, h3 {
    text-align: right;
    font-size: inherit;
    position: absolute;
    bottom: 0;
    right: 0;
} */

/* h2 {
    font-size: 24px;
    position: absolute;
} */

/* h3 {
    bottom: -20px;
    font-size: 18px;
} */
 .invert {
    background: #1f1f1f;
    color: #dcdccc;
}
.invert h2, .invert h3 {
    color: #7f9f7f;
}
.string, .regexp {
    color: #f39;
}
.keyword {
    color: #00c;
}
.comment {
    color: #777;
    font-style: oblique;
}
.number {
    color: #369;
}
.class, .special {
    color: #1181B8;
}
/* body > svg {
    position: absolute;
    top: -80px;
    left: -160px;
} */
 text {
    font-size: 11px;
    pointer-events: none;
}
text.parent {
    fill: #1f77b4;
}
circle {
    fill: #ccc;
    stroke: #999;
    pointer-events: all;
}
circle.parent {
    fill: #1f77b4;
    fill-opacity: .1;
    stroke: steelblue;
}
circle.parent:hover {
    stroke: #ff7f0e;
    stroke-width: .5px;
}
circle.child {
    pointer-events: none;
}

JavaScript

$(document).ready(function () {
    var jsondata =...