Marquee Announcement Bar (scrolling)

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Hi All,

First post.. I am wondering how it is possible to replicate the announcement bar on this website which is scrolling/repeating from right to left (on mobile). Only saw the website because it is listed as an 'example website' for the Brooklyn free Theme. 

I have seen several other posts on this but no clear solution.. I have tried adding a few codes in vain.

Any help is much appreciated