Change Post box sizes

Hi,

I’m using Woo Headlines theme and need to know that how can I change the post box size in the Archive page. I made them smaller on the Homepage as you can see here, https://magiceyemarketing.info

I did some changes in style.css and was able to do it. But now I failed doing the same thing in Archive page where the post related to categories appears.

Would be grateful if someone helps,

Bilal Irfan