Interactive rating component using HTML,CSS (with a little javascript)

It's my first ever javascript challenge...I know I didn't justify this challenge because i have skiped few features....but I really hope you people are gonna like it....now let me come to the problems...In this challenge, you have to select the 1,2,3,.... buttons and then click to the submit button ..then it gonna take you to the new modal...i don't know how to select individual buttons and change its background color ....so i need solutions for it.....and also need tricks and tips about javascript... Please do tell me if I have made any mistake....and I'd be grateful if you can give me some feedbacks to improve 🙏