How can I change the Login Required page style?

There is an .anon class that is added to the html element when there is a non-logged in user. I think that for sites that require login to read content, a non-logged in user can only access the login, FAQ, Terms of Service, and Privacy pages. They are most likely to only access the login page.

You can add a background image to it with something like this:

.anon { 
  background: url(http://wallpapercanyon.com/wp-content/uploads/2016/01/Background-Images-10.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

You can add html to the login_required.welcome_message. Any css classes that you add to that html will be stripped by the Discourse markdown parser. If you need to you can whitelist css classes with a plugin. I think a customized login page is a great idea :slight_smile: