Posts Images

I would like the featured image for the posts on this page https://northvalleywaste.ca/ to stay the same size as the original. (Small and tidy) They are stretching out of proportion to fill the space. This worked .has-post-thumbnail .archive-post-wrap img { width: 60%; } But I removed it so you could see the stretched image. Is there another way to do this so I don't have to try to figure out the sizing for it to then appear at 60%. Also, when I set the site to static home page (currently it is set to posts) and pick a category to appear on the front page they don't appear. The version I'm using is Version: 1.4.6 Has this been fixed in the newer version?