An earlier post covered how to show blog module featured images to the left of the post text. Here's the equivalent CSS for doing the same thing on the standard category / archive / search pages:
Related Post: Adding CSS to the Divi Theme
The final block of CSS that starts "/* Move text over…" re-positions the text even if there isn't an image available, so that the text lines up the same for every item. You may wish to delete this if you'd like to keep extracts with no image as full width.