“Design Hint...
Create a sign up page, modal, form, or app screen related to signing up for something. It could be for a volunteer event, contest registration, a giveaway, or anything you can image.”
See the Pen 100 Days of Design Challenge: Day 1, Login Screen by Jack (@GDES2342) on CodePen.
Design Hint...
What's the main focus? Is it for a book, an album, a mobile app, a product? Consider important landing page elements (call-to-actions, clarity, etc.)