Howdy Andrew,
Welcome to our support forums and thanks for reaching out to us. Hopefully getting that fixed is quite easy 🙂
Just add the following lines to your theme style sheet -located at wp-content/themes/your_theme/style.css-, you can also use a plugin like Simple custom CSS to add this without modifying your theme. Here’s the snippet to insert:
.eventbrite-ticket-embed iframe {
height: 350px !important;
}
Regarding the image you mention, I’m not sure where to find it, Can you point me to the image?
Please let me know if the snippet does the trick,
Best,
Nico