.header, .footer {
  background-color: grey;
  color: white;
  padding: 15px;
}

.column {
  float: left;
  padding: 15px;
}

.clearfix::after {
  content: "";
  clear: both;
  display: table;
}

.left {
  width: 48%;
  float: left;
  padding: 1%;
}

.right {
  width: 48%;
  float: right;
  padding: 1%;
}