Function css_color_hex 

pub fn css_color_hex(name: &str) -> Option<&'static str>

Available on crate feature musicxml only.

The hex value of a CSS3 colour name, as #FF0000 for red, whatever case the name is written in; None for a name CSS does not have.

use music21_rs::musicxml::css_color_hex;

assert_eq!(css_color_hex("Red"), Some("#FF0000"));
assert_eq!(css_color_hex("grey"), css_color_hex("gray"));
assert_eq!(css_color_hex("reddish"), None);