html, body {
  margin: 0;
  padding: 0; }

.d1 {
  height: 120px;
  border: 3px solid #f00;
  width: 150px; }

.d2 {
  height: 100px;
  border: 3px solid #f00;
  width: 150px; }

.d3 {
  height: 40px;
  border: 3px solid #f00;
  width: 150px; }

@media (min-width: 641px) {
  .wrap {
    background-color: #424242;
    height: 800px;
    padding: 20px;
    display: flex;
    display: -webkit-flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center; }

  .d4 {
    height: 200px;
    width: 150px;
    border: 3px solid #00f; } }
@media (max-width: 640px) {
  .wrap {
    background-color: #424242;
    height: 800px;
    padding: 20px;
    display: flex;
    display: -webkit-flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start; }

  .d4 {
    order: -1;
    height: 200px;
    width: 150px;
    border: 3px solid #00f; } }

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