JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header">
    <div id="header-bar">
        Header bar
    </div>
    
</div>

CSS

#header {
    background-color: #ddd;
    position:relative;
    min-width: 1040px;
    height: 111px;
}
#header-bar {
    background-color: #fdd;
    position:absolute;
    top:50px;
    height:53px;
    width:100%;
}