I assume you’re trying to obfuscate the actual domain name. It is better to use “example.com” (which was specifically reserved for the purpose of example URLs), rather than “xxxxxxx.com” (which is a for-sale domain that contains links to p0rn sites).
Looks like the script is using these URLs to load the stylesheets. You might try changing those URLs to point at your local (modified) stylesheets. Couldn’t offer anything more without actually seeing the script.