Hi @kmpg, thanks for posting.
This depends largely on how your site was made. If you made changes to the .htaccess file, the file might still be on your hosting, but isn't in the correct location.
Otherwise, if you have a backup of your site/files, you might want to consider uploading your backup copy.
I figure out the problem, I am using autoptimize plugin and it did create some css files which end up conflicting with my htaccess update. I reverted my changes and is working all good.
Thanks for your help