JSFiddle - React, Tailwind, and code Playground

CSS

#body_1
{
 background: red;   
}

#body_2
{
 background: green;   
}

#body_3
{
 background: blue;   
}

JavaScript

var ids = ['body_1', 'body_2', 'body_3'];
    $(function () {
        $('body').attr('id', ids[Math.floor(Math.random()*ids.length)])
    });