Making drop box options?

Question

I need to know how to make a drop box for various options. Ideally, I want to be able to use one drop box to choose a product. Once the product is chosen, I want the next drop box to contain a color and the next box should contain the size. Each object comes in a different color and different size. How do I create what I want.Anyone know of the CSS code to use or where I can find it?

Answer 1

make different boxes