Why don't I get any CSS output? I did a fresh install of Drupal 8.
Everything had a nice style while installing, but when it was done, there was no CSS anymore.
Did the installation change some file rights?


I tried flushing the cache
I did check if the core/theme folder has CSS files in it
I did a re-install, but again there is just raw HTML


I checked and it looks like I have an HTTP/1.1 500 Internal Server Error on all CSS and JavaScript files.

Update:
The issue is with the .htaccess file in /sites/default/files/.htaccess
I changed the permission of the file to 644, then once changed,
i did edit the file via the file manager and commented out these lines:

#Options -Indexes -ExecCGI -Includes -MultiViews php_flag engine off

It works now but is tis a safe way to do it?
In my case, I was getting this in the apache error log:

.../sites/default/files/.htaccess: Option MultiViews not allowed here


Checking .htaccess, I found:

# Turn off all options we don't need.
Options -Indexes -ExecCGI -Includes -MultiViews


Even though it's turning MultiViews off, it's still not allowed, and removing it fixed the CSS.
Enabling sites to set it int he global apache config would also resolve it.