JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div>So, hello</div>
</body>

JavaScript

$("body").addClass("noScroll");
alert($("body").hasClass("noScroll"));
$(".noScroll").css({
   "background-color" : "pink",
   "position"  : "fixed",
   "width"     : "100%",
   "top"       : "200px"
});
$("body").removeClass("noScroll");
alert($("body").hasClass("noScroll"));