Manogr

That worked mikeg9999!! Thanks so much!!

(I just put the code in my themes custom css area)

Unfortunately this is not working… 🙁

I edited as above and the css code now is:
.ngg-gallery-thumbnail {
float: left;
margin-right: 5px;
text-align: center;
margin-top: -40px!important;

but the whitespace is still there as you can see in http://www.dogpark.gr/greek-dog-breeds/

Any ideas?

thanks