main {
    width: 1100px;
    margin: auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto;
}

main aside {
    grid-column: 1 / 2;
    grid-row: 1 / 2;
}

main article:first-child {
    grid-column: 1 / 2;
    grid-row: 2 / 4;
}

main article + article {
    grid-column: 2 / 3;
    grid-row: 1 / 4;
}