body {
  display: block;
  margin: 8px;
}

#container {
  margin: 0 auto;
  width: 768px;
}

#content {
  display: table;
  margin-top: 10px;
}

.cell {
  border: 1px solid black;
  border-radius: 5px;
  display: table-cell;
  float: left;
  height: 210px;
  margin: 5px;
  position: relative;
  vertical-align: middle;
  width: 372px;
}

.clear {
  clear: both;
}