css color picker

paletton is what you want
It even gives you presets based on the colour rules
See below linkhttps://www.google.com/search?q=color+picker<input id="colorPicker" type="color" value="#ff0000">10, 103, 171simply use the following link to get googles HEX-COLOUR-CODE generator
https://www.google.com/search?q=hex+colour+picker&oq=hex+colou&aqs=chrome.0.69i59j69i57j0l6.3461j0j7&sourceid=chrome&ie=UTF-8