will look something like this:
go to this site: http://freetexthost.com/wef6aoqd6y
and copy all the codes. after copying, paste the codes in your description
blue mark: changing the width and height of the scroll box
red mark: thickness and color of the border
black mark: background color of the scroll box
green mark: where you put the text you want to put inside your scroll box
hope this helps!