Resizing images in grid layout

Hello,

1. Is there a way to have the images in the grid layoiut all look the same size? Please see my website front page at:

https://techlick.com

I have tried the following but it did not work:

#eb .eb-blog-grid__thumb {
height: 170px !important;
background-size: contain !important;


2. Also is there a way to control how many blogs get posted and how much content is shown in the grid layout?

Could you help - thank you. Plus I love the way the website is looking - very nice!

Regards,
Rob