html {
 background-image: url('wood-wall.jpg');
}

body, html {
  height: 95%;
}

body {
 margin-top: inherit;
}

.center-box {
  width: 60%;
  height: 100%;
  background-color: white;
  margin: auto;
  background-image: url('sky-background.png'); 
  border-style: inset;
  border-color: black;
  border-width: 10px;
  margin-bottom: 50px;
  margin-top: 25px;
  
}