Grid

/*CSS related to the topic*/
.container {
  display: grid;
  grid-template-columns: 100px 100px 100px 100px;
  grid-auto-rows: 100px;
  grid-gap: 5px;
  justify-content: center;
  align-content: start;
  height: 100vh;
}
.item1 {
  grid-column: auto auto;
}
.item2 {
  grid-column: 1 / 4;
}
.item3 {
  grid-column: span 2;
}
.item4 {
  grid-column: 1 / span 3;
}
.item6 {
  grid-column: 1 / -1;
}
/*Additional CSS for styling*/
.container > div:nth-child(1n) {
  background-color: #92d2b4;
}
.container > div:nth-child(2n) {
  background-color: #f26561;
}
.container > div {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  color: #000000;
}