H1 size in portfolio items

[Boleyn22]

Hi
On all my portfolio pages the H1 headline, which I use as first headline, does not show in any custom size but always in normal text size. The attachment shows the problem: it’s a H1 title set in XXL size but it shows just normal text size.
See example here: https://www.glauxsoft.com/projekte/swiss-ski-leistungssport-tool/

I supposed this to be a WPBakery Page Builder bug and since I bought a full license of the page builder I contacted their support. Here’s the answer:
———————-

The issue at your end is arising from the following theme code which is setting the h1 size to 18px:
.portfolio-detail h1, .portfolio-detail-description h1 {
font-size: 18px;
}
You can get in touch with the theme author to get rid of the above code from the theme, so that there is no such issue.
———————-

Any other headline formatting works, just not for H1. The problem arose with your last update I think.
Can you please tell me how I can get rid of this?
Thanks!

Ticket