3 column collection list no space between

[dramaviking]

Hi there, 

It's my 2nd day on Shopify, I'm not accustomed with code, but I understand a bit since I worked on Webflow before. 

I use Brooklyn theme.

I want to achieve a similar result like in the picture. 

Is there any documentation I can check or could someone help? 

Thank you very much!

[BriskDevelopers]

It's looks like you need to write custom code inside the section file of theme.

[dramaviking]

Yes, I'm aware of that, I don't have the money to pay someone for it yet.

I'm asking for some documentation at least, some links where I can see how these are made.