html { width: 100%; height: 100%; }
body {
  background-color: #6e878e;
  background-image: url('../graphics/background.jpg');
  background-size: cover;
  text-align: center;
  font-family: verdana, georgia, arial;
}
a {
  color: black;
  text-decoration: none;
}
a:hover {
  color: #555;
  text-decoration: underline;
}
div#header {
  margin-top: 150px;
}