Need assistance with theme and style.css

Need assistance with theme and style.css

Update: Since I haven't had a reply I've been trying for hours to fix this - I copied the style.css from the published site using developer tools.  It is better, at least I can access it now, but it still isn't right.  Can't use the theme/visual editor - I get the message "This theme has no customized option".  So, I still need help!  Please answer!!  I've spent hours and hours on this website.  I writing another message because even my forum message doesn't save or show up.  not sure you are even getting these???  Original message "Please help.. .I was trying to change the site name size container field in the css file and I obviously made a mistake!  I added width 400 px in one of the theme sitename sections  (not even sure which one).  Now the whole site is messed up AND the CSS file is empty.  Why can't I edit the CSS file to simply remove the incorrect code?  I don't want to apply the standard theme as it will remove all my edits!  I've spent a lot of time on this....I sent this message through the site support and about a 1/2 hour later it was working again, so I thought it was resolved  I exited out and now when I log back on, it is back to having the mess.  What is going on?  Please help!!  The published site is fine, can the published site be synced back to the editable site?  donorschooseanimals.zohosites.com  Please help!"