Help with twinkling star animation

Hello everyone!

I was wondering how I would go about creating a twinkling star animation on my own website. A great example of this animation would be on the web link attached below. As you scroll, it reaches “The Evening” tab, allowing for stars to twinkle and move across the screen behind the content. Please let me know how I could go about executing this idea! Any help is greatly appreciated as I am a beginner/student. Thank you!