what are the colors name in html5. how many total colors we can use in html5 and what is the code for them

Answer 1

HTML5 supports 147 color names:

https://www.c-sharpcorner.com/UploadFile/da6585/color-name-in-html5/

You can access 16.777.216 colors from the 24-bit depth RGB color model by using their color code (#rrggbb). If you don't have an image editor, type "color picker" in Google.

Answer 2

use wiki colors go to https://en.wikipedia.org/wiki/Web_colors ,
colors could be rgb values or hex codes
there are also gradient generators online