This is a forum for the editor Notepad++, not whatever you happen to be using the editor for.
However, that’s an easy one: stop using smart quotes. Changing your code to the following worked for me.
<!DOCTYPE html> <html> <head> <meta charset="utf-8"/> <title>Introduction to CSS</title> <style type="text/css"> p { color: red; } </style> </head> <body> <p> Style Me!</p> <p> Style Me!</p> </body> </html>
