body {
  margin: 0;
  background: #eee;
}

#header {
  background: #fff;
  min-height: 50px;
}

#content {
  width: 960px;
  min-height: 50px;
  border: 0px solid red;
  margin: 10px auto;
  overflow: auto;
}

aside {
  background: #fff;
  width: 234px;
  min-height: 600px;
  float: right;
}
aside ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
aside li {
  border-bottom: 1px solid #eee;
  display: block;
  padding: 6px;
}

aside li img {
  vertical-align: middle;
}

#main {
  background: #fff;
  width: 720px;
  float: left;
}