JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">

<div id="bottomleft">
</div>

<div id="topleft">
</div>

<div id="topright">
</div>

<div id="bottomright">
</div>

</div>

CSS

*
    {
    margin: 0;
    padding: 0;
    }
    #wrapper
    {
    margin: 0px auto;
    height: 100%;
    width: 100%;
    }
    #bottomleft
    {
    position:relative;
    height: 50%;
    width: 50%;
    border: 1px solid black;
    float: left;
    box-sizing:border-box;
-moz-box-sizing:border-box;

    -webkit-box-sizing:border-box;

}
    #topleft
    {
    position:relative;
    height: 50%;
    width: 50%;
    border: 1px solid black;
    float: right;
        box-sizing:border-box;
-moz-box-sizing:border-box;

    -webkit-box-sizing:border-box;

    }
    #topright
    {
    position:relative;
    height: 50%;
    width: 50%;
    border: 1px solid black;
        box-sizing:border-box;
-moz-box-sizing:border-box;

    -webkit-box-sizing:border-box;

    float: left;
    }
    #bottomright
    {
    position:relative;
    height: 50%;
    width: 50%;
    border: 1px solid black;
        box-sizing:border-box;
-moz-box-sizing:border-box;

    -webkit-box-sizing:border-box;

    float: right;
    }