How do you change colors in a button?

Answer 1

when and where take change take place?

Answer 2

Suhani Pandya what color are you talking about?
Background-color or text color?

Answer 3

The background, you change it like this :
background-color: red;

or if it is the text-color, do it loke this :
color: red;

(I used color red, but you can use whatever you want(for the background or for the color).