This is an example of a sign in screen that validates a username and a password. Feel free to import this fully editable project into your own account for use in your prototypes.
Use the following to successfully sign in and proceed to the next screen
User Name: john
Password: proto.io
Project using Variables to simulate Drag and Drop to Snap functionality into a predefined area. While also adding Animations and States for a more smooth and elegant process.
Graphics & Credit from: https://www.sketchappsources.com/free-source/3805-clean-web-login-form-sketch-freebie-resource.html.
A simple Login page of a webpage using interactive Proto.io components.