body {
  display: flex;
  flex-flow: row nowrap;
  justify-content: space-between;

  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.overflow1, .overflow2 {
  padding: 8px;
  height: 300px;
  overflow: scroll;
  outline: solid 1px #777;
  margin: 0 20px;
}