Missing Arrow Icon

[ynnckth]

I have a HTML page with some vanilla JS where I want to use json-formatter-js to render an object.

Since I'm not using NPM, I am importing the files from the json-formatter-js/dist folder
(json-formatter.cjs.js, json-formatter.css, json-formatter.esm.js, json-formatter.umd.js).
I am using the dist files from version 2.3.4.

I then import the files into my HTML file with a script import:

<script src="lib/json-formatter/json-formatter.umd.js"></script>

I am using the formatter like:

const formatter = new JSONFormatter(obj);
myElement.appendChild(formatter.render());

It renders the object, however the arrow icons are not displayed correctly. Am I missing an import or something?
Thanks!