.container {
  background-color: cornflowerblue;
}

.container .block {
  margin: 20px;
  padding: 20px;
  background-color: white;
}

.container {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-template-rows: repeat(5, 1fr);
}

.block.block1 {
  grid-area: 1/1/2/2;
}
.block.block2 {
  grid-area: 2/2/3/3;
}
.block.block3 {
  grid-area: 3/3/4/4;
}
.block.block4 {
  grid-area: 4/4/5/5;
}
.block.block5 {
  grid-area: 5/5/6/6;
}
.block.block6 {
  grid-area: 1/5/2/6;
}
.block.block7 {
  grid-area: 2/4/3/5;
}
.block.block8 {
  grid-area: 4/2/5/3;
}
.block.block9 {
  grid-area: 5/1/6/2;
}