Need Chrome/Safari To Play Nice With Self Signed SSL

When attempting to view my site locally on my Macbook Air in Chrome or Safari, I’m first presented with the SSL warning. When I choose to proceed the site loads but without any CSS/JS resources. We use Gulp with our custom theme.

Trellis group_vars/development/wordpress_sites is set for SSL with “self-signed”.

Does anyone know how to overcome this issue?

This has worked for me with my Trellis self-signed certs: