My intentions are to have my thumbnail images fill the custom overlay and css I've altered. I am using the Nova theme by Elegant Themes and their thumbnail for posts is square and makes it difficult to have not square images look good elsewhere. For instance, if the featured image is set in post editor it is cut off partially as post thumbnail. There are gallery images, post thumbnails and a featured slider. I made the thumbnail wider rather than square so it would be more consistent with the gallery and slider images. Only problem is I can not figure out how to get the thumbnail image to fill the space. I have tried adjusting settings in settings/media for image sizes and it does nothing. I'll post a link to an image so you can see what I'm saying. Any help would be greatly appreciated.
Also, after this is fixed, is there a way to update my post thumbnails to the newer format? Thanks again!