CSS to control large article image header

code=yes

.articleimageheader {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 400px;
    background-size: cover; 
    background-position: center; 
    background-image: url('/image.jpg');
}


<div class="articleimageheader">
</div>