.pageone {
  display: flex;
  justify-content: space-between;
}
.box {
  width: 200px;
  height: 200px;
}
.red {
  background-color: red;
}
.blue {
  background-color: blue;
}
.green {
  background-color: green;
}

.pagetwo {
  margin: 50px auto;
}

.pagethree {
  display: flex;
  justify-content: center;
  margin: auto;
}