html {
  box-sizing: border-box;
}
*, *:before, *:after {
  box-sizing: inherit;
}

body {
  margin: 40px;
}

.wrapper {
  margin: 0 auto;
  width: 80%;
  display: grid;
  grid-gap: .5em;
  grid-template-columns: repeat(4, 24.4999%);
  grid-template-rows: none;
  align-content: space-around;
  justify-content: space-between;
}

.box {
  background-color: #444;
  color: #fff;
  border-radius: 5px;
  padding: 20px;
  font-size: 150%;
}

.item1 {
  grid-column: 1 / 5;
  grid-row: 1 / 2;
}

.item2 {
  grid-column: 1 / 2;
  grid-row: 2 / 4;
}

.item3 {
  grid-column: 3 / 5;
  grid-row: 4 / 5;
}

.item4 {
  grid-column: 2 / 4;
  grid-row: 2 / 4;
}

.item5 {
  grid-column: 3 / 4;
  grid-row: 5 / 6;
}

.item6{
  grid-column: 4 / 5;
  grid-row: 2 / 4;
}

.item7{
  grid-column: 1 / 3;
  grid-row: 4 / 6;
}

.item8{
  grid-column: 4 / 5;
  grid-row: 5 / 6;
}
