JSFiddle - React, Tailwind, and code Playground

HTML

<div>
Other Things
</div>
<div class="gcont">
    <div id="topLeft">Top Left Message</div>
    <br /><br />
    Container Div
</div>

CSS

.gcont
{
    background-color:#EEE;
    width:1920px;
    height:100px;
    opacity: 0.5;
    position:absolute;
}

#topLeft
{
    background: #CCC;
    border: solid 1px #999;
    position: fixed;
    text-align: center;
    vertical-align: middle;
    width: 1920px;
}