let red = 51;
let green = 255;
let blue = 51;
let alpha = 128;
let mut html_color =
format!("#{:X}{:X}{:X}",
red, green, blue);
println!("style=\"color: {html_color}\"");
//with transparency
html_color = format!("{html_color}{:X}",
alpha);
println!("html_color is {html_color}");