JSFiddle - React, Tailwind, and code Playground

HTML

<div>
</div>

CSS

div {
    margin: 120px 0 0 20px;
    width: 300px;
    height: 100px;
    background-color: red;
}
div:before {
    content: '';
    display: block;    
    background-color: blue;
    height: 100%;
    width: 100%;
    -webkit-transform: rotate(90deg) ;
    -moz-transform: rotate(90deg) ;
    -ms-transform: rotate(90deg) ;
    -o-transform: rotate(90deg) ;
    transform: rotate(90deg);
}