Userstyles 
Documentation
Userstyles provides API bindings for userstyles.org.
This makes it possible to get styles, their settings and other metadata.
For getting all information about a style you can use get_style.
use get_style;
// Style URL: "https://userstyles.org/styles/37035/github-dark"
let style = get_style;
If you just want to access the css with the default settings you can
use the get_css method with None as parameter.
use Style;
let style = default;
let css = style.get_css;
If you are interested in the css, but want to change the settings,
you can also use get_css. This takes a HashMap with all keys and values you want to set.
You can get all the available settings from Style.style_settings.
use Style;
use HashMap;
let style = default;
let mut map = new;
map.insert;
let css = style.get_css;