JSFiddle - React, Tailwind, and code Playground

by olex

HTML

<div id="masthead"></div>
<div id="page"></div>

CSS

#masthead {position: absolute; width: 100px; height: 200px; background: #ccc; margin: 10px 0 0 10px;}
#page {float: left; width: 900px; height: 900px; background: #ace; margin: 0 0 0 120px;}

JavaScript

$(function() {setHdr(); $(window).scroll(function(){setHdr()});});
function setHdr() {$('#masthead').css({top: $(window).scrollTop()+'px'});}