All my CSS stopped working

Was working on a new website tonight and suddenly all of the CSS stopped working. 

I had Spark Plug in Installed (which I've used multiple times) so I uninstalled it, other than that, I have no idea what happened. 

Any advice would be much appreciated. I can post the CSS I have or wahtever info is needed.

Thanks in advance!

Please post the URL for a page on your site where we can see your issue. For us to see the URL you need to include the link in the content of your post. The URL field the forum software provides is not shown to us.

A link to the backend of the your site won’t work for us, i.e. a URL that contains /config/.

Please set up a site-wide password, if your site is not public and you've not already done so.

Post the password here.

Adding a site-wide password does not allow anyone to alter your site. It only allows those with the password to see your site.

Please read the site-wide password and how to share a link documentation to understand how they work.

You may find How to post a forum question post useful.

We can then take a look at your issue.

Thanks v much for responding. 

The url is: https://hexagon-lizard-587s.squarespace.com/  (Still on trial, being built.)

Password is troubleshoot  all lowercase. 

I did luckily make a copy, so my situation isn't a panic, but I'd prefer not to have to repeat all the work I have done since that save. 

Thanks in advance for any insight, and it's obviously time I invest in a more in-depth CSS course. 

You have syntax errors in your code.

In 'site custom less': 118 src: url('https://static1.squarespa ... 20572063384/Glitten-Regular.ttf');
119 }

120 121 h1,h2,h3 {
  122 font-family: 'Glitten';
  !important; .......................^ SyntaxError INCOMPLETE_PARSE Unable to complete parse.

I don't know what the exact errors are. It appears you may have an errant !important statement.

You might find the W3C CSS Validation Service of use if you are using pure CSS (not using any LESS syntax) in your code.

 Yeah I'm perplexed, I even tried copying the code from the copied site, and no go.

Will check that too. 

Thanks for your time!