Hi @Ningran Meng ,
Welcome to Microsoft Q&A forum.
how do I make a razor component with project status pop up after a click event?
Not sure what effect you want to achieve in the end, can you make a simple sample to explain more detail about the popup card?
Besides, for the popup modal and cards, you could consider using the Boostrap Modals and Cards. You can also refer to the following articles:
Creating Your First Modal Pop Up Custom Component Using Blazor Web Assembly And .NET Core 3.1
Modal Popup Window In Blazor WebAssembly
Best Regards,
Dillion