How to color my button, not just its text

Answer 1

Use background-color

Answer 2

thank

Answer 3

Look at pre-designed styles like Material design components. This will give you a very good head start in good looking web design

Here is my sample program
https://code.sololearn.com/W6ko8pZdwsMF/#html

you can find out more here
https://material.io/components/