read more read less button i have problem with read more read less button

[jon2020]

I have received code here - https://www.w3schools.com/howto/howto_js_read_more.asp

Hello , when i put the code in html is working but when i put 2 or 3 times in 1 page give me problem and not working .

i have try to change the name of id (for example to put id="dots1" , id="more" ,  id="myBtn1" but not function for section 2

so what to do please can help me anyone 

please