Tested in vbulletin version 5.6.4 works fine

Description:
Offers the ability to easily add additional css that will affect all styles

How to install :
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Upload the content of "Yilmaz - Easy Global Additional CSS" to your root.
that's all it.
enjoy..

How to uninstall:
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1. Remove the package "yilmazadditionalcss" that located in /core/packages/
2. Go to "Manage Products" in the admincp and delete the product named "Yilmaz - Easy Global Additional CSS"

How to update:
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After uploading files
-Import XML file (as product) through AdminCP: Plugin System > Manage Products > [Add/Import Product]
OR import the XML file from your server

Kod:
./core/packages/yilmazadditionalcss/xml/product_yilmazadditionalcss.xml