Flags in force directed graph

Hey, can anyone help me with this. In the FCC D3 project “Show National Contiguity with a Force Directed Graph”, a hint for creating a spritesheet of national flags is given. Can anyone explain how to use it? I have generated it and included the CSS file content in my codepen project. But I don’t really know how to use it. Please help.

I finally figured it out. Project Completed!

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