Edit in JSFiddle

div {
    height: 200px;
    width: 50%;
    margin: auto;
    background-image: url(http://placekitten.com/800/200);
    background-size: cover;
    background-position: center;
}

span,img {
    display: block;
    margin: auto;
}

<span>Fondo:</span>
<div></div>

<span>Imagen original:</span>
<img src="http://placekitten.com/800/200">