Requirements and Goals
This article is aimed towards people who want to customize the login screen of their Synology Disk Station beyond the possibilities the settings UI offers. This does however require some basic knowledge of the underlying technology of both, the system and the web overview. It also requires logging in to your disk station via terminal, which, while is possible with only basic knowledge, is always a certain risk. Please be careful, when tinkering around on your device!
The scripts and examples in this article are used to manipulate the CSS and Favicon of your Disk Station's login screen. With the information given, it is technically possible to perform additional changes, such as completely altering the login screen's HTML, though I would not recommend doing this.