Widget width not 100%

Thank you for the very useful and customizable RSS widget!

Everything works well, except that the widget width is set to 92% for some reason (https://surovestrasti.com, on the right-hand side of the page) and not 100%, which is very noticable.

I don’t see an option to make it 100% in the widget settings?

The page I need help with: [log in to see the link]