JSFiddle - React, Tailwind, and code Playground

HTML

<header>
    <span class="mob-left-nav">Relative</span>
   
    
    <div class="tutorials-select__content-item">Relative</div>
   
</header>
<div></div>

CSS

.tutorials-select__content-item{
    background-color: blue;
    height: 100px;
    width: 200px;
    display: none;
}

JavaScript

$(function() {
    $('.mob-left-nav').click(function() {
        $('.tutorials-select__content-item').slideToggle();
    });
    
   
});