How to make a form to switch for login and registration at the same time?

Question

css

Hello!
There was such a question, you need to make it so that when you click on the email button, that is, when you try to log in using email, instead of the registration form, there should be a login form (it’s enough to remove the input for the name there). The question is whether it is necessary to make separate forms for login and registration (like registration is handled by another script, and login by another script). If you are faced with skinte please link)
Thank you in advance for your answer!