.container {
    background-color: lightgrey;
    display: grid;
    grid-template-columns: repeat(4, 2fr);
    gap: 10px;
    margin-bottom: 30px;
}
.item1 {
    grid-column-start: 1;
    grid-column-end: 5;
}

.item3 {
    grid-column-start: 2;
    grid-column-end: 4;

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

    grid-row-start: 3;
    grid-row-end: 5;
}
.item8 {
    grid-column-start: 1;
    grid-column-end: 5;
}