How to make the polyline shape thicker

Question

I made an html code called shapes (you can check it.. it's public) when I wrote the polyline shape code, I got the right shape but it's not thick. how can I make it thick with or without using css styling?
this is the code :
http://www.sololearn.com/app/html/playground/W4GbtjSVCC75/
Regards

Answer 1

Hi
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