Some example input fields for signup part will be
- First Name
- Last Name
- Password x2 one for confirmation
- agree to terms and conditions tickbox
- Signup button
For login
- password
- Login button
Feel free to add more if necessary.
Also user should be able to switch between login and signup.
Design is up to you. You can take inspiration from any website. Maybe add some micro-animations and make it look good.