JSFiddle - React, Tailwind, and code Playground

CSS

.high {
    width:100px;
}

JavaScript

$(document).ready(function () {

    classFinder('.high');
});

var classFinder = function (className) {

    $.each(document.styleSheets, function (index, cssFile) {
        debugger;
        if (cssFile.href) var path = cssFile.href.toString();
        
        var classes = cssFile.rules || cssFile.cssRules;
        for (var x = 0; x < classes.length; x++) {
            if (classes[x].selectorText == className) {
                
                //Find css file name from the file path
                alert(path);
            }
        }
    });
}