Elimination of render blocking resources

HI, I am under pressure to speed up our website in Lighthouse and it seems to all boil down to eliminating render blocking resources and improving the first/largest contentful paint times, particularly the mobile view. Is there a simple way of deferring the css in Foundry? I have tried adding css code that is supposed to defer the stylesheets but it has had no effect at all on the page speeds reported by Google. I know you guys are skeptical about the diagnostics that Google reports, but I have an SEO expert snapping at my heels to make changes to the website to improve the performance - any ideas? thanks