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

.item2 {
    grid-column: 1 / span 2;
    grid-row: 2 / span 3;
}
.item4 {
    grid-column: 3 / 4;
    grid-row: 2 / 4;
    border: solid 5px blue;    
}
.item8 {
    grid-column: 1 / span 4;
    border: solid 5px blue;  
}