i am trying to open a folder containing html and css file but the vscode is getting refreshed?

i’ve taken a udemy web dev course and now i’ve reached css part but the folder she has provided isn’t opening on vscode. before i’ve completed all the html projects . this is the first folder with css file in it. what could be the reason behind getting refreshed. i am stuck.

downloaded the zip file.
extracted it .
tried to open the extracted folder in the vscode.
nothing shows up. not even the html files in it.