Center Promotion Widget

Hi, this is a great widget and I’ve enjoyed using it however I have a bit of an annoying problem on my end. The promotion center is only centered if I set the width to 100% of the page. The client wishes to have a smaller image, however this aligns the widget to the left.

The page is thinkevents.dk/site

I have tried align=”center”, widget style centered, editing theme.css with:

.promo_slider_background_image img {
margin-left:auto;
margin-right:auto;
}

div.promo_slider_background_image {
width: 600px;
margin: 0 auto;
}

However nothing I do makes the slightest difference. Could you please help me with this? I would greatly appreciate it! ??

Also, unrelated to this question, but is there a way to edit the image used for the “fancy title” to another one?

https://www.ads-software.com/plugins/promotion-slider/