JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.noScroll {
    background-color: pink;
    position: fixed;
    width: 100%;
    top: 200px;
}

JavaScript

$("body").addClass("noScroll");
alert($("body").hasClass("noScroll"));
$("body").removeClass("noScroll");
alert($("body").hasClass("noScroll"));