This tutorial is answering a question about how to center align the qr code image generated by qrcode.js library on my previous video: https://www.youtube.com/watch?v=gLLd9YJOJgM&lc
And the answer is relatively easy, we can adjust the styling of the div containing qr code image to make it center aligned.
You can download the library from here: https://davidshimjs.github.io/qrcodejs/
qrcode.js library is very simple and useful JavaScript library that can help you generate qr code images easily.
You can dowload the source code here: https://drive.google.com/open?id=17ZczRpYNWun5IH32Xv9XXp-0b_gsbuwK