Thanks @nate.barbettini and @mraible for your inputs.
Using Okta Sign-In Widget, I did customization in my own login page, it is working now.
But the problem is , I first need to login to my okta developer account first.
It means on the first login to okta account, it is somewhere creating a cookie , so that even if I do not login to okta developer account in next attempts , it is working fine.
Then I tried with clearing browser cookies and all temp data, but don’t know how still it is working for me.
Could you please let me know, if you know more about this.
I don’t want user to redirect to okta site for entering credentials, instead user should be able to enter credentials in my applications own login page, and internally it should go to okta for authenticate user, but user should not view the internal process, he should feel like he has entered credentials to the applications
original login page, I don’t even want to show him okta custom login page for first time as well.