> For the complete documentation index, see [llms.txt](https://docs.chamilo.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chamilo.org/1.11.x/admin-guide/global_features/style_sheets.md).

# Style sheets

As mentioned in section 4.1.14 Stylesheets on page 36, the Chamilo styles can be updated through a simple copy of any of the existing styles located in *chamilo/main/css/*. You'll find a series of styles directories in this directory, e.g. *chamilo\_green*, which can be copied, renamed and modified at wish. To test them, just go to the *Stylesheets* section of your portal configuration page, upload your style as a .zip file and select the style uploaded, then save.