Standardize Featured Content Images dimensions on Homepage

Hi, I really like this theme and will most likely use it as my standard theme from 2021 onwards. One question regarding the preview images of featured content on my homepage. By default, these images all have different dimensions which looks quite uneasy to the the eye when scrolling up&down on the homepage in desktop view (everything looks fine in mobile view though). Is there a way - maybe custom css - which enables me to have all featured content images that are visible on the homepage being displayed at a certain ixed ratio, e.g. 800x800px? I think this would give the homepage a much more clean look. Thanks + kind regards