Changing container hover and height

I’ve been struggling to change the container height and hover so far. I want all the containers to be the same height, the buttons are all different heights and looks sloppy.

I was able to change the text color using:

.simple-theme.wp-posts-carousel .wp-posts-carousel-desc {
color: #000 !important;
}
.wp-posts-carousel-title a {
color: #000 !important;
}

and I applied the same concept to the hover and height but no results. Any suggestions?? Thanks!

https://ww.wp.xz.cn/plugins/wp-posts-carousel/