#container {
  width: 800px;
  margin: 0 auto;
}

#sidebar {
  width: 150px;
  float: left;
}

#sidebar ul, #class-schedule ul {
  list-style-type: none;
  margin: 10px 0 0 0;
  padding: 0;
}

#sidebar ul li {
/*  height: 40px;*/
margin-top: 10px;
}

#main-content {
  width: 640px;
  float: right;
}

header {
  text-align: center;  
  margin-bottom: 10px;
}

#page-heading {
  text-align: center;
  background-color: silver;
  margin: 0;
  padding: 0;
}

.image-sidebar {
  width: 250px;
  float: right;
}

article {
  width: 380px;
  float: left;
}

h2 {
  font-size: 120%;
}

footer {
  clear: both;
  text-align: center;
  border-top: 1px solid black;
  margin-top: 10px;
}