JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="panel">
       <!--<div id="panel-body">
            <div id="contentHeader">Header Bar</div>
            <div id="content"></div>-->
        </div>
    </div>
</div>

CSS

body {
    margin : 0px;
}
#container {
    position : absolute;
    width : 100%;
    height : 100%;
    background-color : #123456;
    text-align: center;
}

#panel {
    height : 90%;
    width : 90%;
    background-color : #FFFFFF;
    margin: 5%;
   
}