How do I change the size and appearance of fonts within an embedded script from an external source?

Hi, I've embedded a code into my website but it looks awful! How do I change the font so it's not all h2 and break it up to look better? Can I also add a button that links back to the workable site? TIA, Mel 🙂 

Here's the code I've got currently: 

<script src='https://www.workable.com/assets/embed.js' type='text/javascript'></script>
<script type='text/javascript' charset='utf-8'>
whr(document).ready(function(){
whr_embed(600567, {detail: 'titles', base: 'locations', zoom: 'city'});
});
</script>
<div id="whr_embed_hook"></div>

Hi,

What is your site url?