How can I create jump links in same page?

Hi,

I want to create a list of items and while people click on the list, it will take user to the list of item in the same page's content.

I had tried to create it with this way:
https://www.w3schools.com/code/tryit.asp?filename=G82AEOGIT7DZ

But the problem is about scrolling. When I click on the top link to send it bottom, it didn't go fully. Besides, the bottom class # link works perfectly.

Can anyone please help me to fix out? Or is there any more easy to create jump...

How can I create jump links in same page?

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