body {
margin:1em;
height: 100%;
padding: 15px;
background-image : url("https://datafixaren48.one/thumb/4ca4238a0b/5_md.jpg");
//  -webkit-background-size: cover;
//  -moz-background-size: cover;
//  -o-background-size: cover;
//  background-size: cover;
}