Javascript and CSS not working after uploading the website online but they are working fine locally

Here is the site in question http://www.rfindings.net/ I have uploaded the code to github - https://github.com/Shaivik7/rfindings

Now the home page has 2 images that should be switching every 4 secs which is not happening online but working fine offline. If you see any missing semicolons I have fixed them and tried again but nothing changes.

And for CSS part I have wrote the media query according to resized browser but the site looks completely different on mobile, I used media query for anything less than 768px but still on mobile it looks completely different.

I am beginner so I hope my code isn't too messy if it is I apologize in advance. I am hosting this site at namecheap If you have to time please take a look.. Thanks