Create Page by MUI

Hi there, it has been one month to develop this project, i still feel exciting as well.

In this challenge, I've learn:

• Image all the page road map at the begining.
• Learn to use useState and switch to control the page
• Learn to retrive data from json file

However, I'm still confusing with something:

• Background image is too big for my page, so I used position: fixed to fixed this problem. Wondering if there's a better way to solve the problem.

• I use stepper in MUI. But I don't know how to change color of the dot in to white and gray. I tried useStyle in the example but failed.

• I haven't finished mobile page yet, I'm not sure how to change background image and css setting depend on media query.

• It would be sparkle while switch the page. I through it is because page is regenerate the component. How can I fixed it ?