Visual improvement for Nginx on file browser or autoindex mode to make it a bit prettier than the original version.
Initially based on https://abhij.it/nginx-auto-index-styling by Abhijit. Thank you!
To use, on the Nginx server configuration, set add_before_body and add_after_body to the before and after HTMLs.
Order of pictures: UI v3.1, v3, v2, v1+ (v1 enhanced) and v1.
Note: UIs v3 have support for portrait mode on a smartphone, not shown on the pictures below (ready for touch - larger buttons, for example).
Feel free to do whatever you'd like with this.