body
{
  background-color: #fcfcfc;
  background: url(wood.jpg) no-repeat center center fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  
  
  
}
.center-div
{
  position: absolute;
  margin: auto;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 500px;
  height: 500px;
  background-image: url("logo.png");
}