Site offline

I was trying to add weight to the text on my website in the Template Style section, at one point I unintentionally clicked the copy button at the top instead of ok, I added the weight, and saved, decided I wanted more when I went back I had an error code that showing that changes could not be made. About five minutes later my whole site went offline. Is there anything that can be done to correct this, as of right now even the back office is offline? Other things on my server are ok. Also my site was completely finished, I was just doing some touch-ups.Thank you.

Hi there,
1.) The offline page of Joomla or just a white screen?
2.) Live url please
3.) What did you copied?? A style ?
4.) Where did you changed the "text width" ??
5.) Screenshot please

Evidently I installed a component I thought was safe, come to find out, it was not. My problems above came from my site being hacked, and sever as well. So getting a new server and will most likely rebuild site with fresh template.
Thank you for your fast reply though!

Ok, many for you answer and good luck!

Some security hints for 99% hacking free site:
1.) htpasswd for "administrator" folder
2.) Never download or use a free extensions
3.) Dont use JCE and make sure you have the newest Joomla version installed
4.) PHP > 5.6

Server Tip if needed
1.) Install mod_geoip and disable all countries you dont need ( asia, russia, turkey and so on)
2.) Disable FTP Server

Thanks for the tips, especially 2&3 I'll pass on the server tips.