Changing the styles of other headings, images, etc with CMS

Hi, I’m trying to have a CMS styling apply to multiple components, such as other headings and videos. For example, if you take a look at the styles manager…Screen Shot 2020-08-27 at 9.36.12 AM

Those elements are affected. Other elements like H3 and videos are not affected, as seen here:

I was wondering how I can get those other elements to also be styled under proj_body?

My Link is Here:
https://preview.webflow.com/preview/matthews-website-4a2c31?utm_medium=preview_link&utm_source=designer&utm_content=matthews-website-4a2c31&preview=2b1761db66cdb84fb6581f11aaa91a05&pageId=5f3c5b7e4cc45d741ef7dca3&itemId=5f3c5b7e4cc45d3370f7dcf5&mode=preview