grid-column-and-row.css

body {
  margin: 0px;
  padding: 0px;
  height: 100vh;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: linear-gradient(120deg, #353b48, #2f3640);
}

.container {
  height: 80%;
  width: 80%;
  display: grid;
  grid-gap: 15px;
  grid-template-columns: 2fr 2fr 1fr;
  grid-template-rows: 1fr 1fr 1fr 2fr;
}

.box {
  font-weight: bold;
  font-family: "Trebuchet MS", "Lucida Sans Unicode", "Lucida Grande",
    "Lucida Sans", Arial, sans-serif;
  color: rgb(204, 204, 204);
  padding: 30px;
  background-image: linear-gradient(120deg, #377ab1, #51409e);
  border-radius: 10px;
  justify-content: center;
  align-content: center;
  align-items: center;
}

.box1 {
  grid-column: 1/2;
  grid-row: 1/3;
}

.box2 {
  grid-column: 2/4;
  grid-row: 1/2;
}

.box3 {
  grid-column: 2/3;
  grid-row: 2/4;
}

.box4 {
  grid-column: 3/4;
  grid-row: 2/3;
}

.box5 {
  grid-column: 1/2;
  grid-row: 3/4;
}

.box6 {
  grid-column: 3/4;
  grid-row: 3/5;
}

.box7 {
  grid-column: 1/3;
  grid-row: 4/5;
}