How can I improve the Form? Specially the output??

Question

https://code.sololearn.com/W38MVEBihzmW/?ref=app

Answer 1

The size of the form is bigger than screen size. It should be created as a card.
Use a colour palette for good UI.

Answer 2

Bugs can you please explain the use of 'card' and 'colour palette'? How to use them?