JSFiddle - React, Tailwind, and code Playground

HTML

<div class="navback">
    aaaaa
</div>
<div class="big">
    sssss
</div>

CSS

.navback{
	left:50%;
	margin-left:-300px;

	background:#000000;
	top: 20px;	
	width: 600px;
	min-width:580px;
	height: 60px;
	position: fixed;
	z-index:1;
	-webkit-border-radius: 20px;
	border-radius: 20px; 
}

.big{
    width:2000px;
    height:2000px;
    background-color:#888888;
}

JavaScript

$(window).scroll(function(){
						
    var left = $(window).scrollLeft();
    if(left !== undefined) {
        alert();
        $(".navback").css('left',-left+10);
    }
});