JSFiddle - React, Tailwind, and code Playground

HTML

<body>
        <div id="header">
             <div id="header-container">
             </div>
        </div>
    </body>

CSS

html, body{
    width:100%;
    height:100%;
    margin:0px;
}

#header{
    width:100%;
    height:100px;
    position:fixed;
    display:inline-block;
    background-color:red;
    padding:0 10px 10px 10px;
}