It is online screen flash. With options to choose between solid & mixed colors along with an adjustable frequency for the blinking. The solid color can be choosen from a color picker & mixed colors is the rainbow colors (VIBGYOR) Usage:

• Solid white with frequency - none can be used to provide extra light on the face
• Mixed option with 100 ms can be opened on multiple devices during a party

Run ng build --output-path docs --base-href /online-screen-flash/ to build the project. The build artifacts will be stored in the docs directory. After build is complete replace the asset ury by ./assets/mixed_color.jpg

Link to the app