body {
  width: 500px;
  margin-left: 100px;
  text-align: justify;
  font-size: medium;
  font-family: Verdana, Arial, sans-serif;
}
#header {
  font-size: xx-large;
  height:50px;
}
#nav {
  font-size: large;
  border-bottom: 1px solid red;
}
#content {
}
.cite {
  padding: 10px 0;
}
.ref {
  text-align: right;
  padding-top: 5px;
}
.center {
  text-align: center;
}
.red, .menu:hover {
  color: red;
}
.grey {
  color: grey;
}