How to add Web as a wizard, so I can create new .css in eclipse?

I just followed the instructions in the link below and downloaded Web Tools Platform (WTP) and Web Tools Platform SDK (WTP SDK) successfully. https://cedocs.intersystems.com/atelier/latest/index.jsp?topic=%2Fcom.intersystems.atelier.help%2Fhtml%2Ftasks%2Fweb-development.html
However, when I wanna new a .css file in my project by select New > Other > Web > CSS, I still cannot find it. What should I do? I have restarted the eclipse what it shows when I search css

Thank you so much!