Okta User Self-Registration Question Continued

This is a follow up question to an earlier post titled “Okta User Self-Registration Question”.

I was able to figure out how to populate a user attribute dropdown field by adding code to the “parseSchema” function of the Registration section of the OktaSignIn widget. I am now able to dynamically populate the field by making a REST/AJAX call to my backend server.

I have just one issue. I need to make the field wider to display more of the selection options. Is there
a way via the OKTA organization platform to configure the width of a particular User Registration attribute?

Registration form is part of the sign in widget. You can change style using CSS: