JSFiddle - React, Tailwind, and code Playground

HTML

<div class="divH"></div>

<div class="divW"></div>

<div class="divReal"></div>

CSS

div {
    border:1px solid;
    background-image: url("http://i.huffpost.com/gen/964776/images/o-CATS-KILL-BILLIONS-facebook.jpg");
    background-position: center center;
    background-size: cover;
    margin: 10px;
    background-color: #000;
    float: left;
}



.divH {
    height: 300px;
    width: 100px;
}


.divW {
    height: 100px;
    width: 300px;
}

.divReal {
    width: 200px;
    height: 200px;
}