I know nothing about CSS, but with a little help, I managed to make the activites button in Shell to display the ubuntu icon. It's great, works good with most all themes.
Except for one part. There is a small gap between the Ubuntu Icon and the icon for the current application (left of the mouse in the second picture).

I know that it wouldn't bother anyone besides me, but when it comes to my desktop I have OCD and need to find a way to get that gap smaller. Is there any way to get the small little area even smaller? Any number I can edit in the CSS file?
I use the icon on Zukiwito-Shell and Faience shell themes, but I believe my problem would be the same with just stock default theme.
The line I add is the one highlighted in this pic (I manually add image.png in the folder of the theme)

Any ideas?