Custom CSS directives can be put into the file custom.css:
- On Linux:
- On Windows:
See the following documentation for details: Using Custom Themes.
Custom themes should be used for customization. See the following documentation for details: Using Custom Themes.
- Developing Extensions for Plesk.
- Example extensions in our GitHub account: https://github.com/plesk/ext-example, https://github.com/plesk/ext-embed-js.
For all questions on developing Plesk extensions, please contact our development team directly by sending an email to