var setSetting = (function(){
    var indexArray = [];
    var styleSheet = function (path) {
        for(var i = 0; i < doc.styleSheets.length; i++) {
            var sheet = doc.styleSheets[i];
            if(path.test(sheet.href)) 
                return sheet;
        }
        return null;
    }(/textview\.css/);
    if (!styleSheet) return false;

    const css = ".textviewContainer{%s}";
    return function(type, value) {
        if (indexArray[type])
            styleSheet.deleteRule(indexArray[type]);
        else
            indexArray[type] = styleSheet.cssRules.length;
            
        styleSheet.insertRule(css.replace("%s",  type + ": " + value + " !important"), indexArray[type]);
        textView.update(true);
        
        return true;
    }
})();

setSetting("font-family", "monospace");
setSetting("background-color", "white");
setSetting("font-size", "12pt");