how to find the css for a website code example

Example: see css from site

var sts = document.styleSheets;
var result = [];
for (var i = 0; i < sts.length; i++) {
    var st = sts.item(i);
    if (st && st.href) {
       result.push(st.href.match(/\w*\.css/));
    }
}
console.dir(result);