MAILING CODE: SUCESS! and animation :D
So I wanted to make like mailing system for addressing the code for authorization. SO, I used the mail that hackclub.app gave aka da @user.hackclub.app mail.
Progress:
1) I initially thought of using my own mail from domain: @heartlyy.dev but turns out there are many issues to it; like the mail going into spam, needing dedicated ipv4 host and many more. So I switched to @user.hackclub.app mail.

Direction for recreation:
* make a .env file with
ADMIN_MAIL= {mail of the one to recieve code}
MAIL_PASS= {password of @user.hackclub.app}
SESSION_SECRET=Xk3v9Qm_2LpZ8wRt # a long session text or jebrish
2) Aesthetic little animation which plays during theme change: Originally, it just changed at a sudden but I think it was quite unpleasant seeing a abrupt change, So, I made an animation like a change of circle which spreads into the site.
