Change the design of registration page

This leads to a few possible options:

https://www.ads-software.com/search/customize+login?forums=1

EDIT: Another plugin:

https://www.ads-software.com/extend/plugins/dbd-login-style/

Thank. these are very nive plugins.

But I want not only change the design but also add some additional fields; for example “country”, “city” and so on. Which plugin would be best for it?

Couple possible options there:

https://www.cimatti.it/blog/cimy-wordpress-plugins/cimy-user-extra-fields/
https://dev.wp-plugins.org/wiki/Userextra

I’ve not used these so am unsure what they offer as to initial registration customization (i.e. extra fields).

Try register plus – if i recall correctly