Add site specific CSS to each blog individually, instead of changing your theme or using a million child themes.
Here are three different ways you can install this plug-in:
Then if you installed as a plug-in (options 1 or 2 above), activate the plugin.
Next make sure you can upload a css file. 1. Goto the Super Admin menu 1. Select options, and near the bottom find a list of all acceptable file extensions. 1. Make sure css is on the list.
Now to use it.