I have created a div tag with image in it , but I cannot force this div to display everything in center of the page :
#mydiv {
position: absolute;
height: auto;
width: 1000px;
min-height: 50px;
}
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" href="responsive-full-background-image.css">
</head>
<body>
<div id="mydiv"><img src="http://dummyimage.com/960x461/FF9900/fff" width="960" height="461" /></div>
</body>
</html>