##language:en
== Modifying the MoinMoin Default Style Sheets ==
If you wish to modify the default Moin``Moin style sheet, it is a good practice to create a new '''.css''' file and use the @import function to import the original `moinmoin.css` file. Override only those attributes you wish to change. Then, if you later upgrade to a newer version of Moin``Moin, any changes to the original `moinmoin.css` file will be incorporated automatically.

The following example assumes you have followed the installation instructions and created an Apache or IIS alias called '''wiki''' pointing to `~/share/moin/htdocs` and another alias called '''wikidata''' pointing to `~/Moin/wikidata` for holding your logos and style sheets.

To override the default body background color and font, use your text editor to create a file called `mywiki.css` with the contents shown below and save it in the directory `~/Moin/wikidata`. 

{{{
@import url("/wiki/css/moinmoin.css");

body {
    background-color: #FAEBD7;  
    font-family: Arial,Helvetica;  
}
}}} 

Next, edit '''~/Moin/mywiki/moin_config.py''' and modify (or add) the following line:
{{{
css_url = '/wikidata/mywiki.css' 
}}}

Test by accessing any wiki page and verifying your changes are correct.

== Allowing Users to Choose a Style Sheet ==
To allow you users to choose between alternate style sheets, you first need to create several choices. Using the example above, change the background-color to `#E7FFE7` and save the file as `green.css` in `~/Moin/wikidata/`.

Test this option by modifying your user preferences to select a '''CSS URL''' of `/wikidata/green.css`. 

Finally, you will probably need to edit HelpOnUserPreferences and change the wording for '''CSS URL''' to instruct your users on the choices available, including the new option for a green background.

'''Note''': When a user initializes or updates their User``Preferences, the default value for '''CSS URL''' will be the value specified in `~/Moin/mywiki/moin_config.py`. Changing the value in `moin_config.py` changes the value for all users, except for those who have explicitly specified an alternate css file.  Any user can return to the default value by erasing the '''CSS URL''' field value and clicking the '''[[GetText( Save )]]''' button.