JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div class="backgroundCell">
    <div></div>
</div>
</body>

CSS

body{
  height: 1000px;
}
.backgroundCell{
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-flow: row;
}
.backgroundCell div{
    width: 100px;
    height: 100px;
    background-color: #ff0000;
}