What are the 3 levels at which a theme can be applied for a web application?

1. At the page level - Use the Theme or StyleSheetTheme attribute of the @ Page directive.
2. At the application level - Can be applied to all pages in an application by setting the element in the application configuration file.
3. At the web server level - Define the element in machine.config file. This will apply the theme to all the web applications on that web server.