JSFiddle - React, Tailwind, and code Playground

HTML

<div id="shopping_button">Your cart</div>
<div id="shopping_cart">
    <div id="btn-close">&times</div>
</div>

CSS

#shopping_button {
    display: block;
    padding: 1em;
    border: 1px solid black;
    background-color: #bdbdbd;
    width: 100px;
}
#shopping_cart {
    display: block;
    border: 1px solid black;
    background-color: #00bb00;
    width: 300px;
    height: 500px;
    display: none;
}
#btn-close {
    height: 20px;
    width: 20px;
    background-color: white;
    position: absolute;
    margin-left: 275px;
    margin-top: 5px;
    text-align: center;
}

JavaScript

$('#shopping_button').mouseenter(function(){
   $("#shopping_cart").css('display','block');
})
$('#btn-close').click(function(){
   $("#shopping_cart").css('display','none');
})
$('html').click(function() {
   $("#shopping_cart").css('display','none');
});

$('#shopping_cart').click(function(event){
    event.stopPropagation();
});