body {
  background-image:url('images/blackboard_6.jpg');
font-family: "Palatino Linotype";
  margin-left: auto;
  margin-right: auto;
  width: 700px;
  text-align: center;
}

h1,h2,h3,h4,h5,h6
{
font-family: "Palatino Linotype";
text-align: center;
}

#div-container {
    width: 700px ;
    margin-left:auto;
    margin-right:auto;
}