Hi sybers, you will have to edit the css file. However be aware that if you edit the catablog.css file you will loose the settings when ever you update the plugin. Your best option is to create a child theme and work from the child theme.
The following is what you might want to edit. I have adjusted the margin and padding.
.catablog-gallery.catablog-row {
display: block;
float: left;
margin: 19px;
padding: 16px;
position: relative;
}
Also remember that the adjustment above will affect all your items from now on unless you create your own unique css styles for this page.
I hope this helps you.
Kind regards
