how to turn a straight line html code to a curved line

Question

I tried making an emoji for practise with a smile but couldn't so it has a neutral line smile
https://code.sololearn.com/W7NX6q74Rq4a/?ref=app

Answer 1

use html 5 graphig svg and canvas... if only a straight line... and if a squre type box pr like a table than use css border-radius property...

Answer 2

https://code.sololearn.com/WE4WXPsI7D26/?ref=app