Fix QR code centering issue

[Harshith-Teja]

Context

This PR solves the issue #4256 of QR not centering

Implementation

Updated the margin property from '0' to '0 auto' for the svg element inside the .qrCode class to center the QR code

Other Information

I'm new to open source, and this is my first PR. I came across this repository as I was searching for 'good first issues'. I'm very thankful to the team for this opportunity!!

[vercel]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.17%. Comparing base (988c6fd) to head (178ab07).
⚠️ Report is 150 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4257      +/-   ##
==========================================
+ Coverage   54.52%   55.17%   +0.65%     
==========================================
  Files         274      297      +23     
  Lines        6076     6729     +653     
  Branches     1455     1619     +164     
==========================================
+ Hits         3313     3713     +400     
- Misses       2763     3016     +253     

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