JSFiddle - React, Tailwind, and code Playground

HTML

<div id="dmain">
<div id="dbanner"></div>
<div id="dmenu"></div>
<div id="dcontent"></div>
<div id="push"></div>
</div>
<div id="dfooter"></div>

CSS

#dmain{
    width: 800px;
    margin-left: auto;
    margin-right: auto;
    min-height: 100%;
    height: auto !important;
    height: 100%;
    margin: 0 auto -25px;
}

#dbanner{
    width: inherit;
    height: 275px;
    margin-left:auto;
    margin-right:auto;
}

#dmenu{
    width: inherit;
    height: 20px;
    background-color: #000000;
    color: #FFFFFF;
    position: absolute;
    border-top: 3px white solid;
}


#dcontent{
    width: 750px;
    bottom: 0px;
    background-color: #FFF;
    padding: 25px;
    padding-top: 75px;
    overflow: auto;
    /*height: 400px;*/
}
#push{
    height: 20px;
    }
#dfooter{
    width: 800px;
    background-color: #000;
    color: #FFF;
    position: relative;
    font-size: 10px;
    padding-top: 5px;
    height: 20px;
    text-align:center;
    margin-left:auto;
    margin-right:auto;
}