I have a script code for my forms, but I’m not sure how to change the font color and font family of the span (labels for the forms)

<script charset="utf-8" type="text/javascript" src="//js.hsforms.net/forms/embed/v2.js"></script> 
<script>
hbspt.forms.create({
region: "na1",
portalId: "40139212",
formId: "758ff855-f664-4297-81d7-ea647222454a"
});
</script>

I had no prior knowledge on javascript, this was just a copy-paste code given to me.