Messed up backend - WordPress
If your backend looks messed up, the css codes doesn’t seem to load, that could happen, if the /wp-content/cache folder isn’t writeable by php, so open it up in your ftp, and change it’s permissions to 755,775 or 777 in this order with everything in it, and based on the server settings one of them will work. You can do that for example with FileZilla, if you connect to your ftp, look for this folder, right click on it and choose on File permissions…
Change the Numeric value to 777, and check the Recurse into subdirectories.
If you are worrying about the 777 permissions, read about it in here.
You could also have this problem, if you turned on the Gzip compression, what you can solve like this.