CSS delivery optimization: How to defer css loading?

Question

I am trying to optimize the CSS delivery following the google documentation for developers https://developers.google.com/speed/docs/insights/OptimizeCSSDeli

Answer 1

Fixed mine by introducing placing all css files at the bottom of the page, after the body tag. but this introduces a new problem, the page loads un-styled html for noticeable mili seconds before applying the style. For this I fixed by introducing a splash screen all styled on the page.