Highlight image size

Hi, Carolina.

I just discovered your theme and have installed it on a new site. Aside from a few minor customisation options, I’m finding it very nice.

Can you tell me which element I’d need to tweak in CSS to adjust the highlights’ image size? I’d like them to be no larger than 150 x 150 px.

When using the Developer Tools in Chrome, I can see that the box size is inherited, but adjusting it at that level doesn’t work. And of course if I try to adjust the overall ‘img’ characteristics, it affects all images, not just the highlights:

img {
    height: auto;
    max-width: 150px;
}

Secondly, I’ve got a static front page, but there’s a big chunk of space between the bottom of the page contents and the footer. Is there a way to get rid of that?

Site link: https://suddenonset.eu/

Thanks very much!