Help with fixing code so it responds to Squarespace style.

Im working an a site fore a venue in Stockholm. We are using a tickets sales site called biletto.se in which you can create codes for adding it events to you own site. Its seams to work properly only that it looks really boring since its using a boring standars form. Trying to figure out if its possible to mace the code respond to the Squarespace style instead.
The generated by billeto.se is as follow.

<iframe allowtransparency="true" class="" frameborder="0" hspace="0" marginheight="0" marginwidth="0" scrolling="true" src="javascript:void(0)" vspace="0" width="100%" height="315" id="billetto_tickets_widget_embed_undefined"></iframe><div class="js-event-widget-powered-by" style="overflow: hidden!important;margin-top: 5px!important;margin-bottom: 5px!important">
<a href="https://billetto.se/l/salj-biljetter-online" style="line-height: 18px!important;font-size: 14px!important;important;color: #666!important;" target="_blank">
<img alt="Billetto" height="18" src="https://fastlycdn.billetto.com/assets/logos/logo_text_dark.fallback-e0d8e74e47241dad1ed72c2d3ab9d3f9780a88ca8e0a226650c6fe9d9e7c38d8.png" style="float: right!important;line-height: 18px!important;height: 18px!important;width: 60px!important;margin-left: 5px!important;display: block!important;outline: none!important;border : 0!important;" width="60">
<span style="float: right!important;font-family: sans-serif!important;">Drivs av</span>
</a>
</div>
<script type="text/javascript">document.getElementById("billetto_tickets_widget_embed_undefined").src = "https://billetto.se//users/3836272/widget_events/?utm_source=Billetto&utm_medium=Widget&utm_campaign=Organiser+Site"</script>

Haven't upgraded it yet. I want to know if this is possible with not to much hassel before I´ll pay😄. Therefore I think the site will be private.

Thanks in advance

8 minutes ago, DanielR said:

We are using a tickets sales site called biletto.se.

it looks really boring...Trying to figure out if its possible to make the code respond to the Squarespace style instead.

You are adding the content using an iframe and this means it is not possible to style the content from Squarespace. You'll only be able to style this content if the third party site (biletto.se) allows you to style it from their platform.

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Can it be added in another way than iframe?
Might be a stupid question. Im a beginner.

8 hours ago, DanielR said:

Can it be added in another way than iframe?

That’s a good question. I recommend you contact the third party supplier and ask them about this.