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List Scrolling Effect

Hi,

I am building a site and have designed something I am not 100% sure how to build.

Attached is my design for a services section, the idea is that each individual services title shows on the left and as you scroll down the page each title gets highlighted.

As each title highlights a corresponding div block will appear that shows the content for the service title.

Does anybody have any ideas on how to achieve this list scrolling effect?

Thanks,

Gabriel