body
{
}
img {
    position: fixed;
    width: 250px;
    height: 250px;
    left: 250px;
    top: 250px;
    z-index: -1;
}

h1 {
    position: sticky;
    top: 0px;
    background: silver;
    /*height:150px;*/
    /*margin:0 0 50px;*/
}