Do not modify the default skins directly, because this skin can be updated by service fix packs and override your changes.
You can create skins in the following scopes:
You can scope a skin to one particular theme. Use this scope if the skin relies specifically on code within the theme or has a specific function that is only useful in that particular theme. These skins are located under the root folder of the theme, and create a specific link between the skin and theme.Global
This is the recommended approach.
The global scope where the skin is not specific for any theme. Global skins are located in the skins folder under the WebDAV root.
All skins created in Portal can be access by the WebDAV skinlist
Parent topic: Skins