div.image-container {
position: fixed;
top: 0;
left: 0;
right: 0;
width: 100%;
height: 100%;
bottom: 0;
background-color: #fff;
z-index: 999999;
text-align: center;
}
.image-holder {
position:fixed;
left: 50%;
top: 50%;
width: 1300px;
height: 300px;
}
.image-holder img
{
width:100%;
margin-left: -50%;
margin-top: -50%;
}