browsh/interfacer/test/sites/smorgasbord/css/main.css

#content {
  width: 500px;
  margin: auto;
}

h1 {
  text-align: center;
}

.left_col {
  width: 45%;
  float: left;
}

.right_col {
  width: 45%;
  float: right;
}

.big_middle {
  clear: both;
}