[Theme: Clear Line] images above post titles on index page

I can’t figure out how to make the images above the post titles on the index page fit into the space. I created posts with thumbnail images and checked the “featured image” box for each one. But when I view the index page, they do not appear wide enough. You can see the problem here: school-bites.com

I am guessing that I need to go to Clear Line Theme Options, but I’ve searched all over and can’t find anything that pertains to this.

Any help would be appreciated!!

Love the theme, by the way!

~Stacy

https://www.ads-software.com/extend/themes/clear-line/