How do you assign things like table, body to a class in CSS?

Answer 1

You do not assign the class in CSS. You assign the class using HTML. Example below:

https://codepen.io/dani-mavis/pen/dybZjRX

Answer 2

You do not assign a page element to a class in CSS. The CSS is where you define the class, but you apply the class to the element in HTML and script file(s).