javascript - smooth scroll by x pixels using arrow keys up and down -


i trying make whole html page smooth scrolling hitting arrow keys , down exact amount of pixels. (example: hit arrow down , page scrolls down 300px hit arrow again , scrolls again 300px, hit arrow key , scrolls 300px...) founded these posts: similiar post similiar post 2but dont know how make arrow keys working it. can please me?

i don't know whether helps or not..but suggestion go through this(jscrollpane.kelvinluck.com) site scroll, have modified web pages have simple scrolls of this..


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