CENTERING RECENT POSTS THUMBNAILS

Hello,

Could anybody help me with some CSS to center the thumbnails of my recent posts? I would like to position the thumbnails horizontally; 2 rows by 3’s = 6 recent posts should be visible.

I did try to use the ff. CSS:

t-posts-widget-with-thumbnails ul { overflow: hidden; }
.recent-posts-widget-with-thumbnails ul li { width: 150px; float: left;}
.recent-posts-widget-with-thumbnails ul li img { display: block; float: none;}

Here’s what happen ->>> https://www.xyzagerondio.com on the footer area.

Please help me!

Thanks.

Xyza