body{
  background: #000 url("shelved.png") no-repeat center top;
}
.content{
  position: absolute;
  top: 40%;
  left: 30%;
  width: 40%;
  background-color: white;
  border: 2px solid black;
  padding: 1em 2em;
  border-radius: 10px;
  box-shadow: -10px 10px 5px #000000;
}