Hi Tonya,
From the generated CSS I’m seeing that the horizontal results width and height are probably set to 110px and 48px.
For the horizontal results the image size needs to be calculated, based on the given width and the height.
If you want an even width/height image, then under the Theme Options -> Horizontal Results panel you can change both values to the desired 110px, it will result in something like this: https://i.imgur.com/am7KzrU.png
You can also leave that custom CSS, if you prefer the current width, but a smaller image size, it should be fine as well.