Border Radius for Facebook Plugin

Hello, I am trying to provide a 5px border radius to the Facebook Feed plug-in. I have tried adding the tag to the grid, div, and inside the div for the embed but still can’t seem to get the effect I want. Any help is much appreciated! Thank you!

Facebook Plug-in: Page Plugin - Social Plugins - Documentation - Facebook for Developers
Hosted Page: https://mpha.webflow.io/


Here is my site Read-Only: https://preview.webflow.com/preview/mpha?utm_medium=preview_link&utm_source=designer&utm_content=mpha&preview=38c0f56b6b7552bf90dc721f646e8af7&workflow=preview