JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container"></div>
<div id="test"></div>

CSS

#container {
    width:100%;
    height:30px;
    background-color:#d45;  
    min-width: 800px; /* must be equal to with of #test */
}

#test {
    width:800px;
    height:30px;
    background-color:blue;   
}