How to reduce margins on Mobile?

Hello fellow wordpressers (-;
I’m having trouple reducing the margin for the blog part of my website. It looks fine on pc, but i’d like it to be smaller when viewing on the phone. I’ve tried the following so far, but with no result:

(@)media only screen and (max-width: 959px){ div#content-wrap { max-width: 95%; } }

website: []( \- and pick one of the 3 posts in the top (the others are just placeholders)

Thank you in advance!


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