CSS once again

Hello,

i want to change the preview of the blog articles. At the moment they look like in the screenshot attached. The font is to big for me, the line-height to small. From another domain i used this css code and wrote it into custom css:

#eb .eb-blog-grid__item--3 {
box-shadow: 0 6px 12px -3px rgba(49, 41, 41, 0.1);
margin-bottom: 15px;
padding: 20px 20px 25px;
margin: 10px;
background: #ffffff;
}

Sorry for that it doens´t work. Can you please help me?

Regards
Frank