JSFiddle - React, Tailwind, and code Playground

HTML

<div id="navBar"></div>
<div id="wrapper">
    <div style="border: 1px solid RGB(0, 0, 0); float: left; height: 500px; margin: 5px; width: 400px;"></div>
</div>

CSS

body {
    margin:0
}
#navBar {
    background: RGB(0, 0, 0);
    height: 30px;
    position: fixed;
    width: 100%;
    top:0
}
#wrapper {
    margin: 30px auto 0;
    width: 980px;
}