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I am a student, I am learning from the source code that I downloaded for free from the internet, the name is the personnel management system, I want to make a blinking notification when the employee is going to get promoted, can you help me !?

This can be done with Javascript. Jquery is a commonly used js library with lots of effects.
Some information about blinking effect on a <div> :
https://stackoverflow.com/questions/5205...ect-on-div

Good luck.