jeronimo42 on "zpbase columns"

As per the tips on the maintainer website:

You can change the number of columns in the Masonry layouts easily. Just add this to the custom CSS in the settings, with a percentage, multiplied finishes at 100 (for example, 10, 25, 33.33, 50):

.masonry-style-item{width:33.33%}

I copied and pasted this code into the custom css area in the theme settings and am not seeing any noticeable changes in the theme. Is there any other way to add columns (sidebar) to this theme? Thanks!